This item is being sold as part of a decluttering of my parents' home. It appears to run when wound, but I haven't tested it for an extended period. As you can see in the photos, the crystal is deteriorated. I'm not knowledgeable about watches, so I can't answer technical questions. I'll list what I know and some requests below: * It has been displayed on a collection shelf for over 10 years. * It hasn't been serviced (overhauled) for at least 10 years. * There are no accessories. * Please check the images for the condition of the item. * The current condition takes precedence in the transaction, even for any overlooked defects. * I haven't performed any detailed operational or condition checks. * I recommend this for those who can clean or repair it themselves, or for those looking for parts. * Returns are not accepted to prevent swapping. Please consider the above before purchasing. It will be shipped via Nekopos (a Japanese delivery service).