Automatic mechanical Tudor Calibre MT5813 movement. 47 Jewels, frequency at 28800 vph (about 70 hours power reserve). Includes column wheel and chronograph function with two sub-dials displaying 60 second and 45 minute measuring scales also features a small seconds hand and date display at the 6 o'clock position. Silver-tone stainless steel case shaped round, bracelet width 22 mm, case size 41 mm thickness approximately 14.4 mm. Scratch resistant sapphire crystal lens over black dial with silver-tone luminous hands and applied index hour markers fixed black stainless steel bezel. Screw down winding/crown set to water resistance up to 200 meters or about 660 feet depth.