Seiko Alpinist Mechanical pairs a robust automatic movement with a rotating compass bezel for reliable outdoor and everyday use. It offers strong water resistance and a clear, magnified sapphire crystal for durable, readable performance. Key attributes: Gray | Acciaio | Stainless steel | 20 bar water resistance | Approx. 72-hour power reserve | Automatic calibre 6R55 | Automatic movement with manual winding | Screw-down crown | Three-fold clasp with push button release | Rotating compass bezel | Date display | Round case | Rotating compass bezel | Date window with magnifier | Lumibrite on hands and indexes | See-through (exhibition) case back | Dimensions & fit: Case diameter: 39.45 mm | Case thickness: 12.7 mm | Lug-to-lug: 46.4 mm | Lug width: 20 mm | Weight: 147.0 g | Composition & care: Stainless steel (case and bracelet, super-hard coating) | Sapphire crystal | Wipe clean with a soft cloth; avoid strong chemicals and extreme temperatures; have the movement serviced by an authorised service centre at regular intervals.