This item was received a few years ago from a neighbor who was moving. A note attached to the teacup says it was made by Takumi Kuroiwa. Many of his works have a unique signature on the bottom, but this piece does not. I remember receiving it for a considerable sum. There are black marks on the inside and outside of the teacup, which were apparently created during the firing process and are characteristic of Takumi Kuroiwa's work. The seller is not an expert. The diameter is approximately 14.5cm and the height is about 8cm. It has a solid feel. Due to the nature of the product, we cannot accept claims or returns. Thank you for your understanding.