This is a Seiko stopwatch. It's solar-powered, so there's no need to replace the battery. The size of the dial is shown in the latter part of the image, so please refer to it. Since I am listing multiple items, please refer to the images for scratches and stains. I have disinfected the item with alcohol and confirmed its operation before listing it, but I do not guarantee its continued operation in the future. Please understand this. This is a one-of-a-kind used item, so I do not recommend it to those who are looking for the quality of a current new watch. If you have any questions, please feel free to ask! Instant purchase is welcome! Items that have not been purchased for a long time may be removed from the listing without notice, please forgive me. Followers will receive a 3% discount on their first purchase. Repeat customers will receive a 5% discount from their second purchase onwards. Please let me know in the comments before you purchase, and I will make the changes. I cannot accommodate follow-up notifications after purchase, so please be sure to contact me before purchasing. I am mainly selling watches, and I am listing various items to organize my collection. I would be happy if you would take a look at my other items as well. ↓↓↓↓↓ #PopotaWatchMen's