This is a trench knife! Made for the up close and personal fighting that was prevalent in the trenches of France! I really like the design of this, the only improvement I would make is to make it a full tang instead of a rat tail!
The Mark I trench knife was an American trench knife designed by officers of the American Expeditionary Force (AEF) for use in World War I. It had a in cm) double edged dagger blade useful for both thrusting and slashing strokes.