Familiar on the outside, radically re-engineered within: the Big Pilot’s Watch Perpetual Calendar ProSet displays the date, day of the week, month, moon phase, and year on the dial. IWC Schaffhausen has retained the classic layout with four subdials, the characteristic four-digit year display at the 7–8 o’clock position, and the signature Double Moon® display. Inside, however, everything has changed. The groundbreaking new module architecture – based entirely on gears – enables true forward and backward calendar adjustability for the first time.