[USED] Extremely rare SEIKO Twin Quartz movement, high performance, gold-plated, 3-hand movement

Purchased from a brand shop.

Slightly aged, typical of vintage watches. Please refrain from purchasing if you are sensitive to this.

Size: Approx. 3.3 x 3.1 cm

Strap: Non-original

Working

This is the world's first twin quartz watch, released by Seiko in 1978. Seiko launched the world's first quartz wristwatch, the Quartz Astron, in 1969. After achieving incredible accuracy of ±0.2 seconds per day and establishing itself as a watch manufacturer, the company began to fully market quartz watches. The Quartz Superior, released in 1974, was the first high-end quartz watch to achieve ultra-high accuracy of within 2 seconds per month, compared to the 15-20 seconds per month of most mainstream watches. By 1976, guaranteed accuracy had been improved to 1 second per month. At the time, it was priced at twice the starting salary of a college graduate, making it a truly coveted model. It features a "twin quartz" design, featuring two quartz oscillators (quartz) that control precision. It was developed based on the idea that using two quartz crystals with different temperature characteristics would offset temperature errors and improve accuracy, a feat of incredible technology for a product with "annual accuracy" at the time. The dial features a double honeycomb-like quartz mark at 6 o'clock, indicating "twin quartz." The slightly thicker oval case features a gold cap, a luxury specification. The ivory dial features elaborately engraved minute indices, and the five-minute increments are marked with onyx, evoking the elegance of a luxury watch. The crown is also inlaid with onyx. With a day-date display at 3 o'clock and a practical design, this high-spec watch is recommended for everyday use. It's a supreme masterpiece from an era when Japanese-made quartz watches were the object of desire.