This is an antique Japanese military sake cup, decorated with a flag, an anchor, a crane, and a propeller. Usually when you see specific items like this it means the person who got the cup was in a position that dealt with whatever item it was - in this case he might've been a mechanic or someone who worked with the propulsion. The soldier's name Ohashi is on the back.

Condition: Mint

Size: 3.25" across