Antique Japanese Military Air Corps Bomber Helmet Army Sake Cup
This is an antique Japanese army sake cup, decorated with an image of a twin engined bomber flying over some trees. The words on the cup are "7th Flying Corps" "Discharge Commemoration" with the exterior of the cup being a helmet with a plane as the base. It's not clear to me which plane this is exactly - the Japanese bombers all look pretty similar when done on cups.
Size: 2" across