Hi Tomb. Judging by it's condition, ID plate and case, I'd say it was
a WWII US compass. Sorry, I have no idea on price - possibly
between $50 and $100.........
It's a US Army, M2 Artillery Compass, the military version of thr Brunston Pocket Transit. It was used in WWII by artillery survey teams. Dwight
I am tempted to say that the compass might be post WWII, it looks to me like a late fifties made version. Don't bet on it though. The M19 case seems to be quite in a good shape, price would very much depend on in what shape the felt on the inside is!