Seiko Prospex S23627 he 1978 Quartz Saturation Diver’s Commemorative Limited Edition: S23627Caliber 7C46Accuracy: +/- 15 seconds per month (between 5°C and 35°C)SpecificationsTitanium inner case with gold color coating (S23626) Zirconia ceramic outer protector (S23626)Titanium inner case with black hard-coating (S23627) Cermet outer protector (S23627)Sapphire crystalScrew-down crownDiameter: 49.4 mm, Thickness: 15.3 mmWater resistance: 1,000m saturation diver’sMagnetic resistance: 4,800 A/mSilicone strapLimited Edition of 800 (S23627)