One Armed Man's Knife aka Civil War Veteran's Knife manufactured in Walden, NY.
These knives were intended to be eating utensils for men with one arm or hand. The back of the blade is the knife while the 3 tines are the fork. Cut the food, then use the fork to pick it all up with one hand.
The handle is silver colored embossed aluminum. Tang is marked Press Button Knife Co. Walden, NY. Manufactured 1890's - 1910. Has lots of scuffs and scratches, discoloration on the blade. Has blade play. Comes with a Maxpedition case.