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A genuine U.S. 1918 Mark I trench knife is a desirable piece of American military history, but it is also easy to misidentify. The first authentication step is not the maker mark, patina, or pommel. It is confirming that the knife is actually a Mark I.
Quick answer: the earlier U.S. Model 1917 and Model 1918 trench knives used a long triangular spike blade. The later Mark I was a different design with a flat blade, a cast-bronze handle, and a metal scabbard. If a knife advertised as an original “1918 Mark I” has the triangular spike of the M1917/M1918 pattern, the model identification is wrong, or the knife is a parts assembly rather than a correct Mark I.
Once the model is established, authentication becomes a comparison of the entire object. Blade profile, grip casting, markings, pommel, scabbard, surviving finish, wear, and provenance should agree with documented period examples. No single stamp proves authenticity. Reproductions can copy lettering, artificial patina can imitate age, and original parts can be combined into a non-original “married” knife.
The most important correction in many online descriptions of the 1918 trench knife is the distinction between the earlier Model 1917/Model 1918 family and the Mark I. The U.S. War Department’s 1919 report America’s Munitions 1917–1918 describes the Model 1917 as having a nine-inch triangular blade. The Model 1918 was a modification of that earlier pattern, with changes to the handle and knuckle guard.
After comparative testing by the American Expeditionary Forces on June 1, 1918, a new pattern was developed. The same War Department report states that the Mark I was “entirely different” from the Model 1917 and specifically identifies its flat blade, metal scabbard, and cast-bronze handle. That distinction should be the starting point for every authentication.
| Pattern | Blade | Handle / Guard | Scabbard | Authentication significance |
|---|---|---|---|---|
| U.S. Model 1917 | Long triangular spike; War Department records specify 9 in. | Wood grip with metal knuckle guard | Earlier pattern sheath | Not a Mark I. A triangular blade is the fastest way to separate this family from the Mark I. |
| U.S. Model 1918 | Triangular spike | Modified handle/guard compared with the 1917 model | Earlier pattern sheath | Also not the later Mark I, despite the shared “1918” date in collector terminology. |
| U.S. 1918 Mark I | Flat, double-edged dagger-type blade | One-piece cast-bronze knuckle handle | Metal scabbard | This is the pattern discussed in the authentication sections below. |
Museum dimensions are also useful as a broad cross-check, although they are not an authentication test by themselves. The Smithsonian’s U.S. Model 1918 Mk 1 with scabbard measures 11 3/4 inches overall, while a Smithsonian U.S. Model 1917 trench knife with scabbard measures 14 inches overall.
The Mark I belongs to the broader history of dagger-like military fixed blades. For blade-form terminology and historical context, see our guide to types of daggers. Readers comparing historical designs with current handmade construction can also browse fixed-blade knives.
The Mark I was the result of wartime testing rather than a simple renaming of the M1918. According to the War Department record, the American Expeditionary Forces compared the U.S. Model 1917 with the Hughes knife, a French pattern, and a British knuckle knife. The criteria included serviceability, speed of use, retention in the hand, suitability while crawling, weight, blade shape, and handle shape. The Mark I combined features judged useful in those tests.
The production record is equally important because it explains why maker names are often confused. The War Department initially placed orders for 1,232,780 Mark I knives, with planned U.S. production by A. A. Simons & Son, Henry Disston & Sons, Landers, Frary & Clark (LF&C), and Oneida Community Ltd. After the Armistice, the order was reduced to 119,424, and the report states that all contracts were cancelled except the LF&C contract.
Do not mix production figures from the earlier models with Mark I production. The same government report says LF&C produced 113,000 and Oneida 10,000 of the earlier Model 1917/1918 trench knives. Those figures appear immediately before the Mark I discussion and are easy to misapply to the later design.
Maker identification matters, but it should follow model identification, not replace it. A plausible marking on the wrong blade, grip, or scabbard is still a problem. Compare lettering, placement, casting texture, pommel form, and scabbard construction as a group.
LF&C is central to the American Mark I story because it is the U.S. contract the War Department records as remaining after the post-Armistice cancellations. On an alleged LF&C Mark I, the maker marking should therefore be evaluated against known original examples, but the presence of “L.F.&C.” by itself is not proof.
Look for consistency between the marking and the rest of the knife: the flat dagger blade, one-piece cast knuckle grip, pommel, metal scabbard, and age-related surface condition should make sense together. Newly cut lettering on an otherwise heavily aged grip, or an apparently original grip paired with a triangular M1917/M1918 blade, is a reason to stop and investigate further.
Collectors also encounter French-made Mark I examples associated with Au Lion. These are commonly identified by a lion/Au Lion mark on the blade ricasso and by details that differ from American LF&C production. The important point for authentication is that a lion stamp is evidence to examine, not a certificate of authenticity. Modern reproductions can copy a visible trademark more easily than they can reproduce the complete manufacturing system and century of documented ownership.
When comparing an Au Lion example, inspect the exact shape and location of the ricasso mark, the casting of the grip, the blade geometry, the pommel, and the scabbard. Compare several documented originals rather than one online photograph. Casting variation, wear, corrosion, and later cleaning can change the appearance of genuine pieces.
The government record shows that Henry Disston & Sons and Oneida Community Ltd. were among the companies originally scheduled to manufacture the new Mark I, but it also says their contracts were cancelled when the order was reduced after the Armistice. That makes unusual maker-marked examples a specialist authentication problem rather than something that should be accepted from a stamp alone.
If a knife carries an uncommon mark, require stronger evidence: clear photographs, dimensions, construction details, provenance, comparison with published reference examples, and preferably an opinion from a specialist in U.S. military edged weapons. Avoid assigning a maker or production quantity merely because the lettering resembles an image found online.
The Mark I does not use the triangular spike of the Model 1917 and Model 1918. The War Department specifically describes the Mark I as having a flat blade, and period photographs show a straight, dagger-like blade with two cutting edges. This is the single most important geometry check.
Do not authenticate the steel by grinding the blade. Surface finish, grind marks, corrosion, sharpening, and later polishing can all provide useful evidence, but they must be interpreted in context. A century-old blade may have been cleaned, sharpened, refinished, or stored poorly. Conversely, a reproduction can be artificially aged.
The War Department description identifies a cast-bronze handle. The one-piece grip combines finger openings, projecting knuckle points, and the guard into a distinctive casting. On a suspected original, inspect the casting under strong side light and magnification. Look for a coherent period manufacturing surface rather than focusing only on the color of the patina.
Do not rely on a published “correct” alloy percentage, weight, or touch-temperature trick as a stand-alone test unless that specification is tied to a documented sample or period drawing. Bronze composition can vary, corrosion products affect appearance, and modern reproductions can be cast from convincing copper alloys.
The pommel area deserves close inspection because replacements and disassembly can leave obvious evidence. Compare the nut or pommel form with documented examples from the same maker/variant and look for tool marks that are consistent with the rest of the knife. A pristine modern-machined part on an otherwise heavily worn knife is suspicious, but wear alone does not prove age.
Do not remove a tight original pommel simply to inspect threads. Disassembly can damage the knife, disturb original surfaces, or reduce collector value. If an internal feature is essential to authentication, have the examination performed by a qualified conservator or military-knife specialist.
The correct Mark I scabbard is metal. This point is explicitly documented in the 1919 War Department account and is a major distinction from the earlier M1917/M1918 family. A rawhide-covered or wood-core scabbard should not be presented as the standard original Mark I scabbard without specific evidence explaining the pairing.
Examine the scabbard as a separate artifact: construction, finish, attachment hardware, dents, corrosion, and wear should be compatible with its claimed age and with the knife. A period scabbard can also be paired later with a different knife, so “old knife + old scabbard” does not automatically mean an original matched set.
Original finish and honest wear are useful supporting evidence, but patina is not a reliable yes/no test. Natural aging is usually complex: protected recesses, exposed edges, high-contact areas, and different metals age at different rates. Artificial aging may be unusually uniform, but a genuine knife that has been cleaned or stored under unusual conditions can also look atypical.
For that reason, use patina to support a conclusion reached from construction and provenance—not as the primary proof of authenticity.
Video Credit: @TheKnifeLifeChannel
A red flag is a reason to investigate, not an automatic conviction. Authentication is strongest when multiple independent features agree and no major construction detail contradicts the claimed model.
Authentication should be non-destructive. Do not grind the blade for a spark test, cut into the metal, file-test the hardness, polish the brass to reveal color, aggressively remove rust, or dismantle a tight original assembly simply to inspect hidden parts. Those actions can erase evidence and reduce collector value.
If alloy identification is genuinely necessary, ask a museum conservator, metallurgist, or qualified specialist about non-destructive analytical methods. In most purchases, careful visual examination, accurate measurements, documented comparison, and provenance are more appropriate than invasive testing.
For a historical military knife, provenance can be as important as physical construction. A name scratched on a grip is not provenance by itself. Strong provenance is a chain of evidence that connects the object to an owner, collection, military service, estate, or earlier sale.
Useful documentation can include period photographs, service records, correspondence, estate inventories, dated collection notes, old purchase receipts, or a traceable auction history. Evaluate the documents with the same skepticism as the knife. A modern typed story placed beside an old object does not make the story old.
This differs from the modern collector market, where provenance often starts with a maker, certificate, invoice, or dealer record. Our custom knife makers directory provides examples of how maker identity and documented authorship function in contemporary collecting, while our collectible knives guide explains the broader roles of rarity, originality, condition, and provenance.
Authentication comes before valuation. Asking prices for trench knives vary widely, and auction estimates can be misleading when several knives are grouped in one lot. For a meaningful market comparison, use recent realized prices for examples that closely match the knife being evaluated.
The main value drivers are:
A polished knife should not automatically be called fake, and a dark untouched knife should not automatically be called original. Restoration and authenticity are separate questions. The correct sequence is: identify the model, authenticate the construction, determine originality and condition, establish provenance, then compare the knife with recent verified sales.
Video Credit: Pawn Stars.
Antique tariff status is not a blanket weapons-law exemption. U.S. Customs and Border Protection states that, for CBP purposes, an antique must be more than 100 years old at the time of importation. The general rate of duty for antiques properly classified under heading 9706 of Chapter 97 of the Harmonized Tariff Schedule is free when the importer can prove the age, but additional tariffs may apply, so verify the current rates before importing. See the current CBP guidance on antiques and artwork.
That customs classification does not, by itself, decide whether a Mark I may lawfully be possessed, carried, sold, transferred, or shipped in a particular state or municipality. The knife combines a dagger-like fixed blade with a knuckle-style handle, so local rules can matter. Before a transaction, check the current law for the destination; our U.S. knife laws by state guide is a starting point, not a substitute for current legal advice.
USPS rules should also be read precisely. Publication 52 places specific mailability restrictions on switchblade knives and states that sharp instruments that are otherwise mailable must be securely packaged so their points and edges cannot cut through the package. See USPS Publication 52. Carrier policies and destination laws may impose additional restrictions.
For exports from the United States, Electronic Export Information (EEI) is not automatically required for every knife. The International Trade Administration explains that EEI filing through AES is generally required when the value under an individual Schedule B number exceeds $2,500 or when a separate mandatory filing reason applies, such as an export-license requirement. See the official EEI guidance.
Practical rule: authenticate the object and verify the current law, customs classification, export requirements, and carrier policy for the actual origin and destination before shipping. Historical age does not automatically override weapons restrictions.
A 1918 Mark I should be treated as a mixed-material historical artifact, not as a modern user knife. The steel blade, bronze grip, coatings or patina, and scabbard can require different care. The goal is to stabilize the object and preserve evidence, not to make it look new.
Aggressive metal polish, powered buffing, sanding, chemical rust removal, or re-sharpening can remove original finish, change geometry, blur markings, and erase tool marks useful for authentication. If corrosion is active, seek conservation advice before treating a valuable example.
The Canadian Conservation Institute notes that iron and steel corrode faster in humid conditions and recommends consistent preventive care for historic iron objects. Its Care and Cleaning of Iron guidance is a useful conservation reference.
Do not assume that leaving the blade permanently inside an old scabbard is the safest storage method. Trapped moisture and contact with deteriorating materials can accelerate corrosion. For long-term storage, the knife and scabbard can be supported separately but kept together as one documented set, especially if corrosion, moisture, or acidic material is present.
If a historical knife has leather or rawhide components from an earlier pattern, replacement scabbard, frog, or associated equipment, avoid casually wetting or oiling them. The Canadian Conservation Institute warns that water can damage rawhide and that aged leather should not automatically be treated with modern dressings. See its guidance on rawhide and semi-tanned leather.
Handle the knife with clean, dry hands or suitable gloves, support the entire object, and avoid touching active corrosion. Photograph both sides of the knife, the blade flats, ricasso, grip markings, pommel, scabbard, and any provenance documents. Good photographs establish a condition record and make later comparison easier without repeated handling.
First determine which model it is. A U.S. Mark I has a flat blade, cast-bronze knuckle handle, and metal scabbard. The earlier M1917/M1918 family uses a triangular spike. After identifying the model, compare the grip, markings, pommel, blade, scabbard, finish, and provenance with documented originals. No single marking is sufficient proof.
No. The 1919 U.S. War Department report describes the Model 1917 as having a nine-inch triangular blade and the Mark I as an entirely different design with a flat blade. The triangular-bladed Model 1918 belongs to the earlier family and should not be confused with the Mark I.
The War Department originally placed Mark I orders with A. A. Simons & Son, Henry Disston & Sons, Landers, Frary & Clark, and Oneida Community Ltd. After the Armistice, the order was reduced to 119,424 and the report says all contracts except LF&C were cancelled. French-made Au Lion Mark I examples are also well known in collector literature. Unusual maker-marked examples require specialist comparison rather than acceptance based on the stamp alone.
The War Department description of the Mark I specifies a metal scabbard. Leather/wood-core scabbards are associated with earlier trench-knife patterns and should not be presented as the standard Mark I scabbard without specific evidence for the pairing.
No. Those procedures can remove original finish and manufacturing evidence or physically damage the knife. Authentication should begin with non-destructive examination, measurements, reference comparison, and provenance.
Authenticity and originality come first. Condition, a correct period scabbard, maker/variant, surviving finish, provenance, and documentation can all affect collector value. Compare recent realized sales of closely comparable examples rather than relying on asking prices or auction estimates.
There is no single answer that applies to every location. Antique customs status and weapons law are separate issues. State, local, federal, destination-country, postal, and carrier rules can differ. Verify the current rules for the specific transaction and location.
The most reliable way to authenticate a 1918 Mark I trench knife is to treat it as a complete historical object. Start with the model: the Mark I has a flat blade, cast-bronze knuckle handle, and metal scabbard, while the M1917/M1918 family uses the triangular spike. Then evaluate the maker markings, casting, pommel, blade, scabbard, finish, and provenance together.
A convincing stamp cannot rescue incorrect construction, and convincing patina cannot replace a documented chain of evidence. Avoid destructive tests and aggressive restoration. When the stakes are high, compare the knife with museum records, period government documentation, specialist references, and multiple known originals before assigning authenticity or value.
For broader historical context, see our guide to antique daggers and the Noblie Custom Knives collection and reference library.
Video by: Noblie Custom Knives
Author: Aleks Nemtcev | Knifemaker with 10+ Years of Experience | Connect with me on LinkedIn | Follow me on Reddit
A very interesting and informative article. As a collector, even I learned a couple of things. Aleks has been fantastic in giving me some advice and instruction on an issue I’m having with my trench knife.
Thanks Aleks!
My brass knuckle knife handle just has a marking of 1918 U.S.
I have a beautiful you. Lion 1918 trench knife I would like to sell. I can’t sell it through eBay. I’ll rate it at an eight. I can send you some pictures. It is a real one. Wanting to know if you guys may be interested in it. I do not have the original scabbard but I do have the metal scabbard
Watching a WW 1 movie peaked my curiosity on these trench knives. Very informative read as well as educational. Now you’ve got on a search for a genuine World War I trench knife.
Jeffrey Klenk – Reach out to me; I’ll help you with that MK1 1918.
News
My friend is not into weapons of war and is in a state of being without money and or a job. So I advised him to sell it so he wants a non-negotiable price of $ 200.00 US Dollars.
I have a WWI US 1918 LF&C knuckleduster trench knife in a leather scabbard. I would like to sell it. Do you have suggestions for how to sell this item? I inherited from my grandparents. Thank you. Jeff
Consider listing your WWI US 1918 LF&C trench knife on auction sites like eBay or specialized militaria platforms, as well as contacting reputable antique or military auction houses for appraisal and consignment options. It might also help to join collectors’ forums or Facebook groups where experts and enthusiasts can offer additional advice and potential buyers.
Hello Sir,
Your column is very useful.
I’m looking for the exact dimensions of a TKT 18, particularly the nut,
in order to verify if mine is authentic.
Best regards,
Thierry Desemberg.
Hello Thierry,
The “TKT 18” you refer to is typically the U.S. M1918 (Mark I) Trench Knife. While exact specs can differ among original wartime manufacturers, here are some commonly referenced dimensions:
Blade Length: Approximately 6.75 inches (17 cm).
Overall Length: Around 11.75 inches (30 cm).
Handle/Knuckle Guard: Cast brass with integrated spikes or ridges, typically marked “U.S. 1918” plus the maker’s name or initials (e.g., “LF&C”).
Pommel Nut Dimensions: Often about 0.5–0.6 inches (12–15 mm) in diameter and roughly 0.3 inches (8 mm) thick, with a thread that’s consistent (not off-center or poorly cast).
Reproduction nuts are sometimes noticeably different in size or thread quality.
To verify authenticity, compare your knife’s markings, handle shape, and nut dimensions with those documented for known originals. Sharp, well-formed manufacturer stamps and quality brass casting (versus brittle or poorly finished metal) are also good indicators of an original piece. If your findings match these standards, there’s a good chance your trench knife is genuine.
I’m trying to find out the value on a trench art knife that I have
The value of a trench knife depends on factors like its condition, materials, craftsmanship, historical significance, and rarity. For an accurate appraisal, consult a specialist in military antiques, or visit online forums and auction sites where similar items are sold.
My trench knife says US 1918
Then on that same side but on the blade part it says United on the other side on the blade it says UC275 under that it says Taiwan. I’m guessing these aren’t worth very much??
Your knife is a reproduction of the U.S. 1918 trench knife, produced by United Cutlery (model UC275) in Taiwan. These replicas are commonly found on the market and typically sell for modest prices. For instance, a United UC275 knife was listed on eBay for $90.
While they hold value as collectibles, especially for enthusiasts of military replicas, their worth is generally limited compared to original World War trench knives.
The knife was banned due to its brutality. Imagine fighting for your life as someone is trying to kill you and thinking, “oh no I can’t do that because it would be rude.”
I believe I found an authentic WW2 tranch knife handle in a Goodwill dumpster but its missing the blade and the small piece (skull crusher) definitely looks the age.
Jegou are you still trying to sell you knuckle duster?
My Uncle got it in ww2
I have a US 1918 au lion in excellent condition what’s it worth
Hello I am looking to sell a US 1918 knife which belonged to my father or can I sell it please.
I have my Dad’s LF&C 1918 knife in a leather sheath that he carried in the Solomon Islands & New Guinea during WW2. I’ll never part with it. Great Info. Thanks
I found a trench knife but with out its blade attached too.. US 1918
perfect article!!
How do you sell an original, 1918 trench knife with the knuckle duster if they are technically illegal? Also, is it legal if you are just a collector and have no intentions to carry it?
Thank you
When considering the sale of an original 1918 trench knife with a knuckle duster, it’s crucial to navigate legal regulations carefully due to the varied weapons laws in different regions. To legally sell such an item, you should:
Research Local Laws: Understand the specific laws in your area regarding antique weapons.
Understand Collector and Historical Item Exemptions: Some regions have exemptions for collectors or historical items, but these don’t automatically apply to all transactions.
Use Appropriate Selling Platforms: Choose platforms that legally allow the sale of such items.
Maintain Proper Documentation and Provenance: Have all necessary paperwork to prove the item’s authenticity and legal status.
Communicate Clearly with Buyers: Ensure potential buyers are aware of the item’s nature and their legal responsibilities.
Adhere to Shipping Regulations: Follow specific rules for shipping weapons, even antiques.
Even if you’re a collector with no intent to use the knife, laws regarding possession, sale, and transportation must be strictly followed to ensure compliance and safety.
I have a trench knife i believe is fake but trying to get an opinion from an expert
Is 1918 trench knife illegal in New York?
The legality of specific knives, including the 1918 trench knife, can be complex and is subject to change over time. The 1918 trench knife, also known as the Mark I trench knife, is notable for its knuckle-duster grip and its spike pommel.
Historically, New York State has had laws against metal knuckle weapons, which could potentially categorize the 1918 trench knife’s distinctive brass knuckles grip as illegal. New York’s penal law, under § 265.01, lists “metal knuckle knife” as a prohibited weapon.
Furthermore, local ordinances in cities, such as New York City, may have their own specific restrictions that go beyond or differ from state laws.
If you are considering owning, purchasing, selling, or carrying a 1918 trench knife or any other weapon in New York, it’s crucial to:
Check the most current state and local laws and regulations.
Consult with an attorney or legal expert familiar with New York weapons laws to ensure you fully understand any potential legal implications.
Remember, laws can change, and interpretations of those laws can vary based on circumstances and specific legal definitions.