Grand Seiko Heritage

The Grand Seiko Heritage, reference STGF277, has a steel case measuring 26 mm in diameter and is set with diamonds. Above the mother-of-pearl dial is a dual-curved sapphire crystal, with anti-reflective coating on its inner surface. Measuring 32.5 mm lug-to-lug, the case is 9.2 mm thick; water resistance is rated to 100 metres. The watch has a date display; the watch has magnetic resistance. The steel bracelet has a folding clasp with push button release. Timekeeping is provided by quartz calibre 4J52, which operates with a precision of ±10 seconds per year.