Rolex GMT-Master II (126710BLRO, 126711CHNR, 126715CHNR, 126720 Lefty)
Some of the topics covered in the caliber listing:
Baselworld 2018 Introduction
The Rolex caliber 3285 was the only new Rolex movement announced at Baselworld 2018.
3285 vs 3186
The new caliber 3285 movement replaces the caliber 3186. It has a larger overall diameter allowing for a larger barrel offering a 70 hour power reserve. The caliber 3285 also has the updated Chronergy escapement allowing for 15% more efficiency as per Rolex claims.
The caliber 3285 is only used in the newer GMT-Master II models:
Rolex labels the new caliber 3285 as a Superlative Chronometer, claiming that it is two times more precise than an officially certified chronometer with an accuracy of -2/+2 seconds per day “after casing”. Superlative Chronometer is an in-house version of testing that goes beyond COSC parameters.
With 10 patent applications filed over the course of its development, this self-winding mechanical movement is a consummate demonstration of Rolex technology, at the forefront of the art of watchmaking. Calibre 3285 offers fundamental gains in terms of precision, power reserve, resistance to shocks and magnetism, convenience and reliability. Calibre 3285 incorporates the Chronergy escapement patented by Rolex, which combines high energy efficiency with great dependability. Made of nickel-phosphorus, it is also insensitive to magnetic interference. -Rolex.com
Lefty GMT-Master II
The caliber 3285 is also found in the green bezel left-handed (destro) GMT-Master II (Ref: 126720VTNR) that was announced at Watches and Wonders 2022.