This is quite an unusual piece. It's a lacquered wood box, round in shape with a flat bottom. The decoration on the box is a boy soldier waving a hinomaru flag and holding a rifle with a bayonet. The base of the box says "Celebration of Imperial Year 2600" "East West Competition Tennis Tournament". The East West Competition seems to be an annual competition - I've seen postwar stamps made to commemorate these tournaments. This particular one dates to 1940, when Japan was in the midst of its celebration of the supposed 2600th anniversary of the founding of the Japanese state with the first emperor. The inside of the box is black lacquer with gold "2600" in very stylized font on the inside of the lid. I put the tennis ball in there for scale.

Condition: Excellent - there are small dark patches on the lacquer. Please see pictures

Size: 5" across