Automatic Seiko NH34 movement Power reserve: 41 hours Stainless steel case Case diameter: 48 mm Case height: 17,3 mm Case back: screw-in glass bottom 30/ 300 m water resistant Dual time and date indication 18 Swiss-made tritium tubes: 13 pcs. in indexes-reflectors on the dial, 4pcs. on 3 hands and one in sapphire capsule in bezel Front mineral glass heavy duty Serial number engraved on the case back Silicone strap + 1 leather strap in the package Custom leather and silicon straps interchangeable by just one screw driver (1 extra strap in package included) Whole watch set is packed to the original XL-size dry box The dry box can be easily transformed to Collector's Box with cells for storage of 4 watches, 4 additional straps and one screw driver