IWC · Automatic

51011

Pellaton automatic winding with a seven-day reserve, running at 3 Hz with a Breguet overcoil hairspring and an 18K gold rotor weight. Pellaton winding uses pawls driven by a cam rather than a conventional reversing wheel, so it harvests energy from rotor movement in both directions and from very small movements — the reason a movement this slow-beating can fill a week's worth of mainspring in ordinary wear.