Original U.S. WWI Model 1918 Mark I Trench Knife by AU LION with Steel Scabbard Breda M-37 The lock currently needs adjustment

The lock currently needs adjustment and will not hold at cock

Has internal pocket for take down tool

which appears to be 27

which were obsoleted when the Luftwaffe moved to larger caliber guns in their bombers

Original U.S. WWI Model 1918 Mark I Trench Knife by AU LION with Steel Scabbard Breda M-37 The lock currently needs adjustmentOriginal Item: Only One Available. The U. S. Model 1918 Mark I Trench Knife was the second major "Knuckle Knife" to be officially adopted and issued to the US military. It was developed for use in the horrific trench warfare that typified the stalemate on the Western Front during the latter part of World War One and saw use not only there, but during World War Two as well. The knife was manufactured in the United States by Henry Disston & Sons (H. D.