US Model 1917 "Knuckle-Duster" Trench Knife
This was the United States' first attempt at a trench warfare style fighting knife.
There were equipped with a triangular "bayonet-style" blade and were considered
somewhat fragile. The grips were wood and the knuckle-guards were either of the
stamped steel "flanged" or "knobbed" styles (two variants are shown above);
there were several variants. This knife was replaced by the
US Mark 1 "Knuckle-Duster" Trench Knife.