There are stains. Diameter is about 10.7cm (upper part of the bowl). I believe this is a tea spill bowl. It's an old item, almost 40 years old. I used to use it a long time ago, but not very often. It has a crane origami design. Japanese style Japanese tableware Bowl Plate Kensui (waste water bowl) Showa retro Japanese culture Tableware Tea utensils How about it for those who like vintage or antiques?