Specifications Grade 1 Swiss ETA Genuine Swiss Made 31 Jewel Valjoux7750 Automatic Chronograph Working Chronometers and Stopwatch Limited Edition SubDials 72 Hour Power Reserve Laser etched crown at 6 o'clock Free Deluxe Box Set, with paperwork & tags Rubber Seal -O- ring on case and crown 904L Stainless Steel Used 1 piece forged case construction Solid 18k gold on all 2-tone models Scratch-proof sapphire crystal 100% correct dial fonts Large threaded screws on band Serial and model # between lugs One-piece solid screw down crown Genuine luminox hour markers Shock resistant movement True hologram sticker Waterproof up to 30 meters