The product is a 1974 Seiko 6139-8020 case and back case, originating from Japan. It is designed specifically for Seiko watches, featuring black color and non-numeric hour marks on the dial. This part is essential for repairing or restoring vintage Seiko watches, ensuring a seamless fit and authentic look. It is a genuine accessory from the renowned brand, perfect for collectors or watch enthusiasts looking to maintain the integrity of their Seiko timepieces.