This is an antique Japanese sake bottle, decorated with a pair of flags, one of which is the Stars and Stripes. The words on the back are "Return to the country commemoration" and the person's name Nakajima. It's interesting how most of the items I've seen for foreign country return are for the US - in comparison you almost never see UK ones.

Condition: Excellent - some fading of the colors

Size: 5.75" tall x 2" across