ETA 2660

A prominent manual-winding mechanical movement from ETA, the 2660 is a caliber recognized for its compact dimensions and fundamental timekeeping capabilities. This movement is also known by the designations A. Schild 746 and Cal. 2660, reflecting its lineage and alternative naming conventions within horology. The ETA 2660 measures 17.2 mm in diameter and 4.1 mm in height, making it a relatively small and slender movement. These dimensions allow for its integration into watches with more modest case sizes or those designed for a thinner profile on the wrist. Within its construction, the movement incorporates 17 jewels. These synthetic rubies are strategically positioned at points of high friction, such as pivots and escapement components. Their purpose is to reduce wear between metal parts, thereby enhancing the movement's operational efficiency and contributing to its long-term durability and consistent performance. Operating at a frequency of 28,800 vibrations per hour (vph), which translates to 4 Hz, the ETA 2660 is considered a high-beat movement. This elevated frequency contributes to the stability of the balance wheel's oscillations, which in turn supports the movement's timekeeping precision. For the wearer, this high-beat rate results in a smoother, less perceptible sweep of the seconds hand across the dial. The movement offers a power reserve of 42 hours. This means that once fully wound, the watch can continue to operate for nearly two full days without needing to be rewound, providing practical convenience for daily wearers who may remove their watch overnight. The complications provided by the ETA 2660 are straightforward: hours, minutes, and seconds. The hour hand indicates the current hour, while the minute hand offers a more granular reading of time within each hour. The inclusion of a seconds hand serves multiple practical purposes for the wearer; it provides visual confirmation that the movement is running, allows for more precise time setting, and can be used for timing short intervals. These fundamental indications ensure clear and practical time-telling. The ETA 2660 powers several distinct timepieces, demonstrating its adaptability across various watch designs.

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Watches Using This Caliber(4)

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