Longines 12.68ZS second pinion

Longines

Founded in 1832 by Auguste Agassiz, Longines is one of the oldest and most respected Swiss watch brands, known for its elegant timepieces, precision sports timing, and strong aviation heritage. The brand's winged hourglass logo is the oldest registered trademark for a watchmaker. Famous models include the HydroConquest, the Master Collection, and the Spirit, a tribute to pioneering aviators. Longines has produced numerous iconic in-house movements, such as the Calibre 13ZN and 30CH chronographs, highly prized by collectors. Longines continues to embody Elegance is an attitude," blending tradition with contemporary appeal."

Pinion

A pinion is a small toothed gear component used throughout a watch movement to transfer motion and power between wheels. Pinions are essential for the gear train, winding system, setting mechanism, and other functions. They may be replaced when teeth, pivots, leaves, or friction surfaces are worn, broken, corroded, or causing poor movement performance.