BRAND : Rolex 

MODEL : GMT-Master II 
MODEL NUMBER : 126713grnr-0001
Model case : Oyster, 40 mm, Oystersteel and yellow gold
Oyster architecture : Monobloc middle case, screw-down case back and winding crown
Diameter : 40 mm
Material : Yellow Rolesor - combination of Oystersteel and yellow gold
Bezel : Bidirectional rotatable 24-hour graduated bezel. Two-colour grey and black Cerachrom insert in ceramic, moulded numerals and graduations
Winding crown : Screw-down, Triplock triple waterproofness system
Crystal : Scratch-resistant sapphire
Water resistance : Waterproof to 100 metres / 330 feet
Movement : Perpetual, mechanical, self-winding, GMT function
Calibre : 3285, Manufacture Rolex
Precision : -2/+2 sec/day, after casing
Functions : Centre hour, minute and seconds hands. 24-hour display. Second time zone with independent rapid-setting of the hour hand. Instantaneous date. Stop-seconds for precise time setting
Oscillator : Paramagnetic blue Parachrom hairspring. High-performance Paraflex shock absorbers
Winding : Bidirectional self-winding via Perpetual rotor
Power reserve : Approximately 70 hours
Bracelet : Jubilee, five-piece links
Material : Yellow Rolesor - combination of Oystersteel and yellow gold
Clasp : Folding Oysterlock safety clasp with Easylink 5 mm comfort extension link
Dial : Black
Details : Highly legible Chromalight display with long-lasting blue luminescence
Certification : Superlative Chronometer (COSC + Rolex certification after casing)