Since 2002, the Big Pilot s Watch has been IWC s flagship. Its IWC-manufactured 51111 calibre one of the largest automatic movements in the world contains all the features that have proved their worth in the long history of IWC mechanical watches. Within no time at all, the automatic movement generates a power reserve of 8.5 days, but only runs for 7 before an ingenious little mechanism automatically stops it. This eliminates the fall-off in torque that occurs as the mainspring winds down, which could lead to loss of amplitude in the balance and unacceptable inaccuracies in the rate.