SPECS: Case Case Material: Stainless Steel Case Size: Thickness: 11.5mm Diameter: 40mm Length: 44.6mm Crystal: Hardlex LumiBrite: LumiBrite on Hands and Indexes Clasp: Three-fold Clasp with Push-Button Release Lug Width: 20mm Movement Movement: Caliber Number 4R36 Movement Type: Automatic with manual winding capability Power Reserve: Approx. 41 hours Number of Jewels: 24 Functions: Half-seconds function; Day/Date display Other details Water resistance: 10 bar Magnetic resistance: 4,800 A/m Weight: 142.0 g Features: Transparent case back / Screw-down case back; Three-fold closure with push-button opening Warranty: Seller's Warranty 1 Year