IWC · Automatic

51111

A seven-day movement wound by IWC's Pellaton system, in which a cam on the rotor rocks a pair of pawls so that motion in either direction feeds the barrel. The 168-hour reserve comes from a single oversized barrel rather than two, and the slow 3 Hz beat is what lets one barrel run that long. Compared with the 51011 it gains a balance bridge in place of a balance cock — anchored at both ends, so the balance staff stays truer under shock.