Solingen. Likely no earlier than the 1950s. Not a U.S. Marbles clone but the pattern seems to draw from some of their knives. It is similar to the 'shark' knives (mk 1 and similar) and the 225Q knives of WWII, both of which had leather washer grips.
The blade may have been re-profiled with a point break and that would attest to it seeming extra sturdy in the point.
Try here
https://www.usmilitariaforum.com/for...edged-weapons/
and here
https://www.bladeforums.com/forums/b...ification.691/
Cheers
GC