This is a copperware product from Tamagawa-do. I called Tamagawa-do, and they said it is currently out of production. I am also a machine technician, though in the past. The rice stalk pattern on the front and back, which is characteristic of Tamagawa-do, has some dirt and scratches. Please refer to the photos for noticeable areas. There is no blue on the rim. This is a used item, and I believe there may be oversights, so please understand. The dimensions are 21cm in diameter and 3.5cm in height. It comes with a box. When closing the lid, please align it with the right side of the rice stalk pattern on the box lid and then close it. It is old. Unfortunately, it looks like it was cleaned with a slightly stiff cloth. Returns are not accepted.