I purchased this about 20 years ago at a pottery fair in Saga Prefecture. It's a corner chopstick rest from Ippogama. It can be used as a chopstick rest or as a small dish for appetizers. The black stain-like mark on the upper left of the blue piece (in the fourth photo) is from when I purchased it. I've used it about twice. It has been stored at home, and there is some dirt on the back. I will wrap it in cushioning material and send it via Yu-Packet Post Mini.