ID This???

TRAP55

Serial number and DWM is all that's on it.
Ruled out G-41/43 variations, and the FG-42.

searcher5

Don't have a clue what it is, but a quick internet search, assuming this is gun related, comes up with DWM as being Deutsche Waffen- und Munitionsfabriken Aktien-Gesellschaft (German Weapons and Munitions public limited company), known as DWM

Pathetic as Wikipedia is, this article may give you a clue as to what you have. Or not![:D]

http://en.wikipedia.org/wiki/Deutsche_Waffen_und_Munitionsfabriken

dcs shooters

Looks like it might be a gas regulator key for a German rifle or machine gun.