I'm not very knowledgeable, but this is a Seiko 5 automatic watch from the Showa era. It works when shaken. I wore it for about an hour, and the time seems to be correct. I could also adjust the calendar and time with the crown. I don't know the overhaul history, and it's just working for now, so please understand that it's being sold as a junk item. Belt: Third-party (adjustable length) - Brand: SEIKO - Model: Automatic watch - Color: Champagne Gold - Material: Stainless steel - Features: Date display (day and month) Thank you for looking.