I just got few pw and one case with U.S on it
and have no clue what was in it.
size 12 movement fits in it snap on back cover
looks like nickel no markings.

back side

gap

missing inside bezel .

hi Peter; that is a case for an army compass I'm certain ,best wishes,Tom

and here is one identical but has a minor ding center of case

http://www.ebay.com/itm/Vintag...54e90#ht_3201wt_1182

thanks Tom.
Now I need to find me a compass .