【High-Accuracy Quartz】 Thanks to Seiko's quartz technology, it provides accurate time. Manufactured in 1978, the then-highest-end model, the "Seiko Superior Twin Quartz." Equipped with a main crystal oscillator for timekeeping and a sub-crystal oscillator for temperature detection, it corrects errors caused by temperature changes, achieving high accuracy with an annual rate of error. This is a historical model that cannot be overlooked when discussing Seiko's history. It works. Elegant and cool. ■ Brand Name: Seiko ■ Product Name: Superior Twin Quartz ■ Year of Manufacture: 1978 ■ Case Size: 37mm (excluding the crown) ■ Case Material: Stainless Steel / Cap Gold ■ Belt: Leather ■ Windshield Material: Glass ■ Dial: Ivory ■ Movement: Twin Quartz ■ Specifications: Non-waterproof / Date & Day ■ Accessories: Belt included