Rolex cal. 3131
The Rolex cal. 3131 is an in-house developed self-winding (automatic) movement used in their Milgauss & Air-King models. It was introduced by Rolex in 2007 and features their proprietary Parachrom Bleu Hairspring and the Paraflex balance shock protection. It has a frequency of 28,800 beats per hour (A/h) and a power reserve of 48 hours, COSC certification, 31 jewels and Hacking seconds.
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Rolex Air King 40 ref. 116900 – 2019, Superb condition, Full set
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Rolex Air-King 40 ref. 116900 – 2011+ (Random serial)
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Rolex Milgauss ref. 116400GV Z-Blue – Polished per OEM specs
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Rolex Air-King 40 ref. 116900 – Full set, 2019, Polished per OEM Specs
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Rolex Milgauss ref. 116400 Intense Black dial on an Everest strap – Polished per OEM Specs
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Rolex Milgauss ref. 116400 White dial – Box & Booklets, Polished per OEM Specs
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Rolex Air-King 40 ref. 116900 – 2019, Superb condition, Full set
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Rolex x Bamford Milgauss One of/Unique piece ref. 116400 – Fully Engraved with Alligators, PVD