Thank you for looking. This is a small storage case made from a recycled old wristwatch from the manufacturer Nikko. It does not have a watch function. The band is made of stainless steel, and when the pins are adjusted to the maximum, the inner circumference is about 18 cm. The case also appears to be made of some kind of metal. The back cover is just lightly fitted, so if you're careful, you can open it with your fingernails. Case width: approx. 33mm Band width: approx. 15mm It can hold two 500-yen coins. One 1000-yen bill also fit if folded small. I think it could also be used to carry daily medication, etc. There is some overall signs of use. *The 500-yen coin in the second photo is not included in the product. Thank you for your consideration.