The Rolex Caliber 3187 is a significant movement in the brand's history, representing a notable evolution in their robust and reliable automatic chronometer offerings. While less frequently discussed than some of its predecessors and successors, the 3187 holds a special place, powering the iconic oversized 42mm Rolex Explorer II reference 216570. Understanding its intricacies, including the number and role of its jewels, requires delving into its design, functionality, and place within the broader Rolex movement landscape. This article will explore the 3187 in detail, referencing related calibers like the 3185 and 3186 to provide a comprehensive understanding of its position within the Rolex movement family.
The Caliber 3187: A Chronometer of Precision and Adventure
Introduced in 2011, the Caliber 3187 replaced the Caliber 3186 in the Explorer II. This wasn't a mere incremental update; it signified a refinement of existing technology and a commitment to enhancing performance and reliability. The movement is an automatic, self-winding caliber, meaning it utilizes the natural movement of the wearer's wrist to wind the mainspring, eliminating the need for manual winding. This is a crucial feature for a watch designed for robust use, such as the Explorer II, which is often associated with exploration and adventurous activities.
Central to the 3187's functionality is its dual-time, GMT complication. This allows the wearer to simultaneously track two different time zones. The independently adjustable GMT hand, a hallmark of the Explorer II, is crucial for this functionality. Unlike some GMT movements where the hour hand jumps in one-hour increments, the 3187's GMT hand can be adjusted independently, making it exceptionally user-friendly for travelers frequently crossing time zones. This independent adjustment is achieved through a clever design incorporating additional components and precise tolerances. The date function, displayed in a window at 3 o'clock, adds to the watch's practical utility.
The number of jewels in the 3187, while not explicitly stated by Rolex in their official documentation, is typically in line with other movements of similar complexity and design within their range. High-end mechanical watches, including those from Rolex, use jewels (typically synthetic rubies) at points of high friction within the movement. These jewels minimize wear and tear, ensuring longevity and accuracy. Their precise placement is critical for the smooth operation of the intricate mechanism. While the exact count might vary slightly depending on the specific manufacturing batch, a typical high-end automatic movement of this caliber would boast between 28 and 31 jewels. These jewels are strategically positioned in the escapement, the gear train, and other areas subject to significant friction. This careful engineering contributes to the 3187's reputation for accuracy and reliability.
Comparing the 3187 to its Predecessor and Related Calibers:
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