Caliber Number: 4R36 / Movement Type: Automatic with manual winding capacity / Duration: Approx. 41 hours / Case Material: Stainless steel / Crystal: Hardlex / LumiBrite: Lumibrite on hands and indexs / Clasp: Three-fold clasp with push button release / Water Resistance: 10 bar / Case Size: Thickness: 11.5 mm. Diameter: 40 mm. Length: 44.6 mm. / Other Specifications: Screw case back. See-through case back. Three-fold clasp with secure lock. / Other Features: 24 jewels. Day/Date display. Stop second hand function.