The Rolex Explorer II, a rugged and reliable tool watch designed for exploration and adventure, has seen several iterations throughout its history. Two key movements have defined a significant portion of its production: the Caliber 3185 and its successor, the Caliber 3186. Understanding the differences between these movements is crucial for collectors, enthusiasts, and anyone considering purchasing a pre-owned Explorer II. This article will delve deep into the nuances of these two calibers, providing a detailed comparison and practical methods for identifying which movement resides within your watch.
Differentiating the 3185 and 3186: The "Wiggle Test" and Beyond
One of the most widely discussed methods for distinguishing between the 3185 and 3186 movements involves the "wiggle test," focusing on the independently adjustable hour hand. This feature, crucial for navigating in low-light conditions, behaves differently in each movement.
The Wiggle Test (Hour Hand Adjustment):
* Caliber 3185: When adjusting the hour hand independently on a 3185 movement, you'll notice a distinct "wiggle" or play as you move it forward or backward. This is due to the slightly less refined mechanism used to control the hour hand's independent adjustment. The movement feels less precise and more "loose."
* Caliber 3186: The 3186 movement, an improvement over its predecessor, features a more refined and precise mechanism for independent hour hand adjustment. The "wiggle" is significantly reduced, almost imperceptible. The hour hand moves with a smoother, more controlled feel. This improved mechanism contributes to the overall enhanced precision and reliability of the 3186.
Beyond the Wiggle Test: While the wiggle test is a quick and readily accessible method, it's important to note that it requires a degree of sensitivity and experience. A subtle difference might be difficult to discern for those unfamiliar with the feel of both movements. Other methods should be considered for confirmation:
* Caseback Engraving: The most reliable method is to check the caseback engraving. The movement caliber will be clearly indicated. Look for "3185" or "3186" engraved on the caseback. This is definitive proof.
* Serial Number: Rolex serial numbers are often correlated with the year of manufacture and can help narrow down the likely movement. However, this isn't a foolproof method as there can be overlaps in production runs. Cross-referencing the serial number with online resources dedicated to Rolex serial number decoding can provide a helpful indication, but should not be relied upon as the sole identifier.
* Service History: If the watch has a comprehensive service history, the service records should specify the movement caliber used.
Rolex Caliber 3185: A Closer Look
The Caliber 3185 is a self-winding mechanical movement with a power reserve of approximately 48 hours. It's a robust and reliable movement known for its durability and accuracy. It boasts a date function and, importantly, the independently adjustable hour hand, vital for the Explorer II's functionality as a tool watch. The 3185 was introduced in the late 1980s and served as the heart of the Explorer II for a considerable period.
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