IWC has updated its stunning Big Pilot's Perpetual Calendar watch with a new ceratanium case and British racing green dial. The 46.5mm case is finished in black with white markings to contrast the green face. IWC's 52615 automatic movement operates for up to seven days and features an 18-carat gold medallion rotor. The perpetual calendar indicates the day, month, and four-digit year along with moon phases for the northern and southern hemispheres. The Big Pilot's Perpetual Calendar is limited to 250 units worldwide.