This was given to me by a friend when they were cleaning out parents house.. I don't know much about Nippon but looking at the stamp/mark on back research estimates this piece is from between 1916-1921. There is some visible wear and imperfections as stated above. No cracks or chips though. See photos carefully for assessment. I can only assume this is a saucer. It is approx 6" in diameter or a hair over that.