Seiko Style 60's Open Heart pairs an open-heart skeleton dial with reliable automatic Caliber 4R72. Designed for everyday wear, it highlights the movement through a cut-out dial and a see-through case back. Key attributes: Black | Yellow gold | Stainless steel | Water resistance 5 bar | Approx. 41-hour power reserve | Automatic movement (Cal. 4R72) | Leather strap | Stop-second hand function | Manual winding possible | Open-heart skeleton dial | Box-shaped Hardlex crystal | See-through screw case back | Lumibrite on hands and indexes | Dimensions & fit: Case diameter: 39.50 mm | Case thickness: 12.0 mm | Lug-to-lug: 46.2 mm | Lug width: 20 mm | Weight: 64.0 g | Composition & care: Stainless steel | Hardlex glass | Leather | Wipe with a soft cloth. Do not operate the crown underwater and avoid exposure to solvents and strong magnetic fields. Service at an authorised service centre as recommended.