Grand Seiko Heritage

The Grand Seiko Heritage, reference SBGR301, has a 42 mm steel case. Self-winding calibre 9S61 has 33 jewels and approximately 72 hours of power reserve. The case measures 13.1 mm thick and 47.9 mm lug-to-lug; water resistance is rated to 100 metres; magnetic resistance is 4,800 A/m. A dual-curved sapphire crystal has an anti-reflective coating on the inner surface. The watch has a see-through case back; the case has a screw-down crown. Movement precision is +5 to -3 seconds per day. A steel bracelet closes with a folding clasp with push button release.