This is a vintage Seiko King Quartz wristwatch, reference 9721-8010, representing Seiko’s high-grade quartz watchmaking during the late 1970s. Historical Background During the 1970s, Seiko was at the forefront of quartz watch technology. The King Quartz series was positioned above standard quartz models, offering higher precision, refined finishing, and a design philosophy aligned with Seiko’s upper-tier mechanical lines such as King Seiko. Movement This watch is powered by a Seiko high-quality quartz movement, known for its stability and accuracy. The battery has been replaced, and the watch is running at the time of listing. Dial and Design The silver-tone dial features a clean, understated layout with applied baton indices and slim hands, emphasizing clarity and elegance. The minimalist design reflects Seiko’s refined aesthetic of the late 1970s, focusing on precision and legibility rather than ornamentation. Case The stainless steel case measures approximately 35.1 mm in diameter (excluding the crown), resulting in balanced proportions suitable for daily wear. The case shows visible signs of age and use consistent with a vintage watch, including light surface marks, while retaining its original shape. Case Back The screw-down case back is engraved with Seiko markings indicating stainless steel construction. Reference and serial numbers are clearly present, confirming originality. Strap The watch is fitted with a leather strap that shows signs of prior use but remains fully functional and suitable for continued wear. Condition and Notes The watch has been carefully cleaned. As a vintage quartz watch, it was running at the time of listing following battery replacement; however, long-term performance cannot be guaranteed. Water resistance is not guaranteed. Shipping The watch will be carefully packed and shipped with tracking to ensure safe delivery.