3/31/20 - We believe this is a WW2 era German pocket knife. The blade shows aging and is stamped "SOLINGEN", which is commonly found on WW2 dress daggers, comparable to our word "patent". There are no other markings. The action is VERY tight on this knife, and takes some effort to open, but still locks and functions well along the hinge. The wood handle has no cracks or chips and appears all original. Blade is about 2.5 inches. 4.25 inches when closed.