automaattikojunasta

Automaattikojuna, also known as a self-winding or automatic watch, is a mechanical timepiece that automatically winds its mainspring using the motion of the wearer’s wrist. The mechanism relies on a rotating weight, called the rotor, which is coaxial with the watch. As the wearer moves, the rotor oscillates in response to gravity or centrifugal force, transferring energy to the mainspring through a gear train. This eliminates the need for manual winding while still providing the accuracy and tactile engagement of a traditional mechanical watch.

The design of automaatikojuna dates back to the late 19th and early 20th centuries when horologists sought to reduce the labor-intensive manual winding practice. Early models such as the Seiko 7S24 (1955) popularized the concept, and modern iterations from major brands—such as Rolex, Omega, and Patek Philippe—combining precision, durability, and aesthetic appeal. Many automaatikojuna also incorporate a power reserve indicator, typically a small dial or hand that displays the remaining hours of power.

In terms of wear, these watches are prized for their minimal maintenance requirements compared to manual watches; still, regular servicing (every three to five years) is advisable to ensure lubricants remain effective and mechanical components function smoothly. The combination of self-winding functionality and traditional craftsmanship makes the automaatikojuna a favored choice among both collectors and everyday users.