The Rolex Datejust, a cornerstone of the brand's collection, has seen numerous evolutions throughout its history. One significant leap forward came with the introduction of the caliber 1520, a high-beat movement that marked a notable upgrade in accuracy and performance. While the exact model number "15200" doesn't exist in Rolex's official nomenclature (the reference numbers typically refer to the entire watch, not just the movement), the 1520 movement, and its close relatives within the 152XX series, deserve a detailed exploration. This article delves into the intricacies of this important movement, its place within Rolex's history, and its comparison to other calibers within the brand's extensive catalog. We'll also address common search queries like "Rolex 1520 movement for sale," "Rolex movement chart," "Rolex 1520 vs 1530," and "Rolex 1520 and 1530."
The 152XX series of movements, which includes the caliber 1520, represents a significant step forward for the Datejust. It replaced the relatively short-lived 150XX series, which itself had only been in production for a few years. This transition marked the introduction of the first high-beat caliber into the Datejust line. The "high-beat" designation refers to the increased frequency at which the balance wheel oscillates, typically 28,800 vibrations per hour (vph) compared to the older standard of 18,000 vph. This higher frequency translates directly into greater accuracy and improved resistance to shocks and impacts. The increased precision offered by the 1520 movement was a substantial improvement over its predecessors and contributed to the enhanced reputation of the Datejust for reliability and timekeeping excellence.
The development of the 1520 caliber was a testament to Rolex's ongoing commitment to innovation and horological advancement. The high-beat movement required significant engineering and manufacturing improvements to ensure both accuracy and durability. Rolex's meticulous attention to detail is evident in the construction of the 1520, which incorporates features designed to maximize its performance and longevity. These features include the use of high-quality materials, precision manufacturing techniques, and robust construction, all hallmarks of Rolex's commitment to quality.
Rolex 1520 Movement Specifications and Features:
While precise specifications often vary slightly depending on the exact sub-model within the 152XX series, the key features of the caliber 1520 generally include:
* High-Beat Frequency: 28,800 vibrations per hour (8 beats per second), significantly improving accuracy and shock resistance compared to earlier, lower-beat movements.
* Automatic Winding: The movement utilizes a self-winding rotor system, efficiently transferring energy from the wearer's movements to wind the mainspring. This eliminates the need for manual winding, providing continuous power reserve.
* Date Function: The Datejust’s signature instantaneous date-changing mechanism is seamlessly integrated into the caliber 1520, ensuring accurate and reliable date display.
* Hacking Seconds: A feature that allows the seconds hand to stop when the crown is pulled out, facilitating precise time setting.
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