Grand Seiko Heritage Collection

Grand Seiko's 9F quartz is not the quartz anyone else makes. Regulated to within ten seconds a year, it uses a twin-pulse motor strong enough to drive heavy hands, a backlash auto-adjust mechanism that stops the seconds hand jittering, and a sealed cabin keeping dust from the movement for fifty months between battery changes. The case is Zaratsu-polished by hand and the indexes are diamond-cut and applied individually.

Reference: SBGP009
Movement: Grand Seiko 9F quartz, ±10 seconds per year
Case: Steel, 40 mm
Water resistance: 100 m
Year: 2026 — Full set