ETA 2678

An automatic mechanical movement from ETA, the Caliber 2678 is also recognized by its alternative designations, 2678 and ETA 2671. This self-winding caliber is designed to provide reliable timekeeping and practical daily complications within a compact form factor. The ETA 2678 features a diameter of 17.2 mm, making it a notably small movement. This compact size allows watch manufacturers to integrate it into smaller watch cases, catering to designs where space is a premium or a more discreet wrist presence is desired. Within its construction, the movement incorporates 25 jewels, which are synthetic rubies strategically placed at points of high friction. These jewels serve to reduce wear on metal components, thereby enhancing the movement's longevity and contributing to its operational stability. The balance wheel oscillates at a frequency of 28,800 vibrations per hour (vph), equivalent to 4 Hz. This high frequency results in a relatively smooth sweep of the seconds hand and contributes to the movement's ability to maintain accurate timekeeping. For watchmakers and timing professionals, the movement has a specified lift angle of 49°, a crucial parameter for accurately calibrating timekeeping instruments. Powering the movement is an automatic winding system, which recharges the mainspring through the natural motion of the wearer's wrist. Once fully wound, the ETA 2678 offers a power reserve of 38 hours. This means that if the watch is taken off the wrist, it will continue to run for up to 38 hours before requiring manual winding or further wear to resume operation. Beyond the fundamental display of hours, minutes, and seconds, the Caliber 2678 integrates two practical complications: a date display and a day display. The date complication shows the current day of the month, while the day complication indicates the current day of the week. These features provide the wearer with comprehensive daily temporal information at a glance. The ETA 2678's combination of automatic winding, compact dimensions, and full calendar complications positions it as a versatile caliber for a range of watches. Its 17.2 mm diameter is particularly suited for timepieces where a smaller movement is advantageous. This caliber powers watches such as the ETA Mido Commander 1959 Lady Yellow Gold / Champagne / Bracelet (Ref. M7169.3.72.13), which features a 23.5mm case, and the ETA Mido All Dial Stainless Steel / Silver (Ref. M7330.4.11.12), with its 30mm case. In both instances, the movement's dimensions allow for its integration into these relatively smaller watch cases, providing automatic functionality and daily utility through its day and date displays.

Specifications

Complications

Also Known As

Watches Using This Caliber(2)

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