This is a Seto-ware clay pot steamer (dobinmushi). There are 4 sets. They have been stored in a cupboard for a long time. I have no information about when they were made or how long they were used. I can only tell by the appearance that they are Seto-ware. Please check the condition of the items in the photos. They are designed to be used directly over a gas flame, and there are no cracks or chips. There appears to be a crack on the bottom, but it is not broken. They have been used a few times, but they are long-term storage items, so please understand and accept this.