I found this in the storage room at my parents' house. Around 1968, my grandmother would sometimes drink sake from this. The mouth has a radius of 4.5cm and a height of 6.5cm. It has some dirt from being used in the past. I think it will come off if washed. It's made of very sturdy-looking glass. I would be happy if someone who likes old things would appreciate it. Thank you very much.