It all depends on how original it is. If Grandpa brought it back from WW1 and it was never monkeyed with, then could be pretty valuable. They run anywhere from $300 up to $1000. But, again that is all based on originality and condition. Photos would help others (not me, I'm not the expert) to give a better price.

daveboy

P.S. It's a pretty sure bet that it's worth $75!