This is an antique Japanese military sake cup, decorated with a company flag with three zigzag lines. There's also a collar tab that's pretty unusual - it has 37.3 on it, denoting 37th Infantry 3rd company. It's the first time I've seen a company number on a tab on a cup. The words are "Term Fulfillment Commemoration". The soldier's name Koemado is on the back.

Condition: Mint

Size: 3" across