Thank you for viewing. This is a rare vintage SEIKO model, the 8Y21-0050. It's a very unusual watch with a beautiful black and gold contrast design. This is a very rare model that is hard to find on the market, so it is also recommended for collectors. 【Thorough Maintenance and Product Condition】 This product has been specially maintained as follows so that you can use it with peace of mind for a long time. Battery replacement: The battery has been replaced with a new one in December 2025. It is currently running accurately. Exterior maintenance: The case body has been carefully **polished**. The entire watch has been cleaned with alcohol, so you can use it cleanly as soon as it arrives. Waterproof measures: When the battery was replaced, waterproof silicone grease was applied to the rubber packing on the back cover to improve the sealing. About the belt: The strap has been replaced with a new, aftermarket leather strap (black). Condition: There are small scratches on the windshield (glass surface) that can be seen visually. It does not impair visibility, but please understand it as the texture of an antique item. Due to being a vintage item, there is fine wear and tear on the case body due to aging. 【Details】 Brand: SEIKO / Seiko Model number: 8Y21-0050 Movement: Quartz (battery-powered) Accessories: None (body only) 【About Transactions】 Authenticity Guarantee: In the unlikely event that the item is found to be a fake or imitation, we will refund the full amount and accept returns. Please rest assured. Price negotiation: Price negotiations are also possible. Please feel free to let us know your desired price in the comments section. 【For International Buyers】 This product can be purchased from overseas by using purchasing agent services such as Buyee, ZenMarket, and From Japan. Thank you for your consideration. #SEIKO #Seiko #VintageWatch #AntiqueWatch #Quartz #8Y21 #RareModel #RareItem #Maintained #BatteryReplaced #NewBelt #PriceNegotiable #Buyee