Seiko 6N76

Seiko caliber 6N76 is a quartz movement made in Japan. It measures 26.4mm in diameter and 3.4mm thick, operating at the standard quartz frequency of 32,768 vph with no jewels. The movement features a big date complication at 6:00 using dual date wheels to display both digits, and includes hacking seconds. A single SR621SW battery provides up to three years of operation, with Seiko claiming accuracy within ±20 seconds per month.