🔹 Overview
The RL GMT-Master II 40 mm Ref. M126710GRNR-0004 is a refined travel watch engineered for modern globetrotters. Crafted in corrosion-resistant Oystersteel, it pairs a sleek black and grey Cerachrom bezel with a robust Oyster bracelet, giving the watch a sporty yet understated character. Built to track two time zones simultaneously, this GMT-Master II houses RL’s advanced Calibre 3285, delivering both cutting-edge performance and timeless reliability.

💎 Key Specifications
Origin: Switzerland, Oyster Perpetual GMT-Master II collection
Case Diameter: 40 mm Oyster case in Oystersteel
Case Material: Solid Oystersteel with polished lugs and brushed sides
Bezel: Bidirectional 24-hour graduated Cerachrom insert in black and grey, platinum-coated numerals
Dial: Black lacquer with Chromalight display for long-lasting blue luminescence
Hour Markers: 18 ct white gold with Chromalight luminous fill
Bracelet: Oystersteel Oyster bracelet with Oysterlock clasp and 5 mm Easylink extension
Crystal: Scratch-resistant sapphire with Cyclops lens over the date
Water Resistance: 100 m / 330 ft with Triplock crown system

⏱️ Movement
Caliber: RL Calibre 3285, perpetual self-winding mechanical movement with GMT function
Escapement: Chronergy escapement for improved efficiency
Hairspring: Parachrom for enhanced magnetic resistance
Shock Absorbers: Paraflex system for durability
Certification: Superlative Chronometer (−2/+2 sec/day after casing)
Power Reserve: Approximately 70 hours
Frequency: 28,800 vph (4 Hz)
Jewels: 31
Functions: Hours, minutes, seconds, 24-hour second time zone, independent local hour adjustment, instantaneous date with rapid setting, stop-seconds for precise synchronization

✅ Conclusion
The RL GMT-Master II Ref. M126710GRNR-0004 delivers versatility, performance, and contemporary style. Its understated black and grey bezel makes it stand out as a subtle yet modern traveler’s companion, while the Oyster bracelet adds durability and comfort. With the state-of-the-art Calibre 3285 inside, this GMT-Master II offers 70 hours of power reserve, precision within ±2 seconds per day, and superior resistance to shocks and magnetism. A perfect blend of functionality and prestige, it remains one of RL’s most essential models for professionals and frequent travelers.