The Empress Diana includes the following features - 316l surgical-quality stainless steel case, jeweled seiko nh35 automatic movement, jewel bearings - 24 jewels, 41 hour power reserve, beats per hour (bph) - 21600/hour, sapphire-coated mineral crystal, custom engraved mother of pearl dial, 4 crystal hour markers, observation caseback to view movement, crystal set bezel, enamel color-tipped crown, genuine leather strap, logo-engraved stainless steel clasp, luminous hands, 38mm case diameter, 5 ATM water resistance.