Seiko 5 Sports SRPD55 SRPD55K Automatic Nylon Watch - Specifications:Seiko 5 Sports Series#SRPD55K3100m Water Resistance - Black Dial - Nylon Band - Analog 3 Hands Display - Day/Date Display - Unidirectional Rotating Bezel - Automatic with Manual Winding Capacity - Caliber 4R3624 Jewels41 Hours Approx. Duration - Stainless Steel Case - Hardlex Crystal - Lumibrite on Hands and Indexes - Screw Case Back - See-Through Case Back - Stop Second Hand Function - Case Size Diameter: 42.5mm - Case Size Thickness: 13.4mm