Longines 290 automatic device with rotor

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."

Rotor

A rotor is the oscillating weight in an automatic watch movement that winds the mainspring as the watch is worn. It rotates with wrist movement and transfers energy through the automatic winding system. Rotors may be replaced when worn, loose, noisy, damaged, rubbing against the caseback, or missing from an automatic movement.