Seiko stopwatch, manual winding, working. There are scratches and dirt due to aging. Also, there is a crack in the windshield glass. However, I have been using it as is, so I think it can be used for the time being. It seems to be quite sturdy. The diameter of the main body is about 57mm, and the thickness is about 16mm. With string, no case, no instruction manual. Start, stop, and reset functions work without problems. The feature is that it can accumulate time. Press once to start, press again to stop, and press again to continue accumulating time. The button on the upper left is for reset. (300-2) The following is an AI's assessment: Silver Seiko stopwatch with a blue strap. - Brand: SEIKO - Color: Silver - Strap Color: Blue - Function: Stopwatch Thank you for viewing.