Seiko 11A

The Seiko 11A represents a manual winding mechanical movement manufactured by Seiko. This caliber is designed to power timepieces through the stored energy of a mainspring, which the wearer manually winds via the watch crown. Central to the 11A's construction are its 23 jewels. These synthetic rubies are strategically placed at points of high friction within the movement's gear train, such as pivots for wheels and pinions. Their purpose is to minimize wear and tear on metal components, thereby enhancing the movement's durability and contributing to the stability of its timekeeping over extended periods. The movement operates at a frequency of 18,000 vibrations per hour (vph), which translates to 2.5 Hertz (Hz). This oscillation rate means the balance wheel completes 2.5 full swings per second. For the wearer, this frequency dictates the sweep of the seconds hand, which advances in five distinct steps per second, providing a smooth visual progression around the dial. A fully wound Seiko 11A movement offers a power reserve of 45 hours. This specification indicates the duration for which the movement will continue to run accurately after being fully wound and subsequently removed from the wrist. A 45-hour power reserve allows the watch to remain operational for nearly two full days without requiring another winding, offering convenience for daily wearers who might not wear the watch continuously. In terms of its physical dimensions, the Seiko 11A has a diameter of 37 millimeters. This measurement is significant as it largely determines the minimum case size required for watches housing this movement. A 37mm diameter suggests the 11A is suited for watches that are moderate to larger in size, influencing the overall wrist presence of the timepiece. The movement's height is 4.6 millimeters. This dimension contributes directly to the overall thickness of the watch case, indicating that timepieces powered by the 11A will have a certain profile on the wrist. Collectively, these specifications define the Seiko 11A as a robust manual movement. Its jewel count and operating frequency contribute to its mechanical integrity and timekeeping characteristics, while its power reserve offers practical convenience. The movement's dimensions dictate the design parameters for the watches it powers, influencing both their size and profile.

Specifications

Watches Using This Caliber

No watches linked to this caliber yet.

Related Seiko Calibers