Certina 25-651 rotor

Certina

Founded in 1888 by Adolf and Alfred Kurth, Certina is a Swiss watch brand known for its robust and sporty timepieces, particularly those featuring its DS" (Double Security) concept for enhanced shock and water resistance. The brand has a strong association with motorsports and diving. Famous models include the DS Action Diver, DS Podium, and DS-2, all embodying durability and precision. Certina primarily uses reliable ETA movements, often with custom finishing or Powermatic 80 enhancements, ensuring excellent performance. Certina continues to offer high-quality, resilient watches for active lifestyles."

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.