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IWC Big Pilot's Watch Perpetual Calendar Cellini Limited Edition This IWC Big Pilot's Watch Perpetual Calendar Cellini limited edition is 46mm of titanium exclusivity. Forget the fact that only fifty of these limited edition pieces were created in 2006 for New York's Cellini Jewelers, this Big Pilot Perpetual Calendar remains the only such model ever created in titanium. Despite its 46mm case, this IWC Big Pilot wears light and easy thanks to the aerospace-grade titanium case. The grey metal sports a subdued brushed finish that plays premium in any light, and its color is a perfect tonal complement to the matte black dial. The classic IWC Big Pilot "instrument" style carries over from the reference 5004, but the rich array of complications adds visual nuance and technical sophistication. Each register of the calendar is coordinated with the others, and a simple twist of the crown advances all indications in sequential order. This Big Pilot Perpetual Calendar is no more challenging to set than a date window on a Rolex. Inside the cavernous titanium carapace of the IWC Big Pilot Perpetual, and in-house automatic caliber 51612 keeps the beat with precision and durability. Its free sprung balance resists shock while a Breguet hairspring resists position-induced timing variance. A seven-day power reserve keeps the complex calendar in step when the watch is off the wrist, and efficient "Albert Pellaton" automatic winding keeps the power supply topped off. See this rare and alluring IWC Big Pilot's Watch Perpetual Calendar Cellini limited edition of 50 pieces in high-resolution images on Video and content by Tim Mosso