Grand Seiko Heritage Collection Stainless Steel 37MM 9S55 3 Day Watch - Black. This watch typifies the standard of high quality at Grand Seiko. Boasting a 72-hour power reserve and combines the latest in hairspring technology with an escapement developed through Seiko’s MEMS technology to achieve accuracy and stability when worn. The stainless-steel case features an exhibition sapphire case back and, on the dial, there is a high definition dual-curved sapphire crystal with an anti-reflection coating on the inner surface. A date display window rests at the three o’clock position. The stainless-steel bracelet close is a three-fold clasp with push button release. This watch has a water resistance for to 100 meters.