Rolex GMT Master II watch, round 18kt yellow gold case (40mm diameter, 13mm thickness) with shoulders to protect the screw-down Triplock winding crown, 18kt yellow gold Oysterlock bracelet with Easylink, black dial with luminous hour markers, scratch-resistant ceramic rotatable 24 hour bezel, special green GMT 13 hour hand specifically designed for the 50th anniversary of the introduction of the GMT Master allowing simultaneous use of a second time-zone, date calendar at 3 o’clock, 31 jewel Caliber 3186 self-winding Oyster Perpetual chronometer movement, scratch-resistant sapphire crystal, water-resistant to 100 meters. Some of the design improvements in the new model include a new scratch resistant black ceramic bezel, anti-counterfeiting “RolexRolexRolex” engraving along the inner bezel, new Triplock crown, new maxi-dial (larger luminous hour markers and fatter hands), new solid link bracelet and clasp with half-link extension, and new #3186 Caliber Oyster Perpetual mechanism with smoother 24 hour hand movement.