Seiko Presage Midnight Blue Moon Cocktail Time Automatic Watch SRPK15J1 Calibre no.4R35 Movement TypeAutomatic with manual winding Power Reserve/Battery LifeApprox. 41 hours Case Band MaterialLeather CrystalBox-shaped Hardlex Other SpecificationsDate display Layout Water Resistance5 bar Case SizeThickness: 11.8 ㎜ Diameter: 40.5㎜ Lug-to-lug: 47.5 ㎜ Features Other FeaturesSee-through case back Screw case back Jewels: 23