Brand Seiko Model No. SRP775K1/SRPE91K1 Series Prospex Gender Pria Case diameter 44 mm Case thickness 13 mm Water resistant Divers watch 200 meters/20 ATM/20 BAR Case material Stainless Steel Case back Screw case back Glass material Hardlex crystal Strap material Stainless Steel Lug Width 21 mm Clasp Folding clasp Calendar Day and Date Luminious / LumiBrite Yes Driving system Automatic 24 Jewels Hand and automatic winding capabilities Caliber No. 4R36 21,600 vibrations per hour Power reserve approximately 41 hours LumiBrite Hands and Markers Calendar Day and Date display Water resistant 200M / 20 ATM Remark / Features One way rotating elapsed timing bezel