This is an antique Japanese military sake cup, decorated with a picture of a fortress heavy artillery piece, a star, and the words "Fuukayama Heavy Artillery Regiment" "Term Fulfillment Commemoration". This is a fortress in Wakayama prefecture, guarding one side of the Seto sea entrance.

Condition: Excellent - there are some kiln deposits (appearing as white dots) on the left

Size: 2" across