U.S. WWI Model 1918 Mark I Trench Knife
The Mark I trench knife is an American trench knife designed by officers of the American Expeditionary Force (AEF) for use in World War I. It has a 6.75 in (17.1 cm) double-edged dagger blade useful for both thrusting and slashing strokes, unlike previous U.S. trench knives such as the M1917 and M1918.
Inscribed on handle: “U.S. 1918, L F & C 1918