The Rolex Explorer II reference 16570, a rugged and highly sought-after timepiece, boasts a fascinating history tied to its internal mechanism. Produced from 1989 to 2011, the 16570 utilized two primary movements: the Rolex Calibre 3185 and its successor, the Rolex Calibre 3186. While functionally similar, subtle differences and rarity make understanding these movements crucial for collectors and enthusiasts alike. This article delves into the nuances of the Rolex 3185 vs 3186, exploring their specifications, production history, and the implications for those seeking a specific Explorer II.
Rolex 3185 vs 3186 Movement: A Comparative Analysis
Both the 3185 and 3186 are automatic, mechanical movements manufactured by Rolex. They share a common lineage and many design features, inheriting Rolex's renowned reliability and precision. However, the 3186 represents a refinement and evolution of the 3185, incorporating several improvements.
The Rolex Calibre 3185, the earlier movement, served as the backbone of the 16570 for a significant portion of its production run. It's a robust and dependable workhorse, renowned for its accuracy and longevity. It features a Parachrom hairspring, a key component made from a paramagnetic alloy that is resistant to magnetic fields, enhancing the timepiece's accuracy and stability. The 3185 also incorporates a Kif Parechoc shock absorption system, protecting the delicate balance wheel from impacts. Its power reserve is approximately 48 hours.
The Rolex Calibre 3186, introduced in the latter half of 2007, built upon the foundation of the 3185 but incorporated several key enhancements. The most significant upgrade is the introduction of a new escape wheel and pallet fork geometry. This improvement, while subtle on paper, translates to enhanced efficiency and potentially longer service intervals. While the exact details of these modifications are proprietary to Rolex, it's widely believed that these changes contribute to improved longevity and reduced friction within the movement. Like the 3185, the 3186 also features the Parachrom hairspring and Kif Parechoc system. The power reserve remains approximately 48 hours.
The differences between the 3185 and 3186 are not readily apparent to the naked eye. Both movements are meticulously finished and decorated in the typical Rolex manner. Detailed examination by a trained watchmaker would be required to distinguish between the two. The only definitive way to identify the movement is through close inspection of the movement itself, specifically looking for the engraved calibre number.
Rolex Explorer 3185 vs 3186: The Impact on the 16570
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