Thank you for viewing. This is a mechanical self-timer made by RIKEN. It's an old vintage accessory with the "RIKEN JAPAN" stamp. I don't have any knowledge about cameras, so I don't know how to check if it works, and I'm selling it as junk. Also, the screw on the part marked in the photo has come off. [Product Condition] Junk item. No operational guarantee. There are small scratches, scuffs, and dirt due to aging. Please check the condition of the product in the photos. If you have any questions, please feel free to comment. Please consider the above before purchasing. #RIKEN #RIKEN #CameraAccessories #FilmCamera #Vintage #Retro #Junk