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Recommended: Rolex Explorer II Ref. 226570

That would be the Caliber 3285, the same engine found on today’s GMT-Master II.The Explorer II and the GMT-Master II had previously shared the movement (3186) before the brand increased the size of the former to 42mm on that model. already (Resulting in a build of the 3187 to compensate for larger cases.) This movement is among the best features Rolex has to offer today: the Chronergy Escape, 70 hours of power reserve, the blue Parachrom balance spring and the Paraflex shock absorber. This move is more efficient, more accurate, stronger and lasts longer without winding.

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