The IWC Big Pilot Perpetual Calendar Le Petit Prince watch, known as reference IW5028-01, is a one-of-a-kind timepiece from 2013. Made with a platinum case and a beautiful sunburst blue dial, it was auctioned off at Sotheby's Geneva in November of that year for CHF 173,000 (including buyer's premium). The entire amount was then donated to the Foundation to help build a school and library in Cambodia. A truly special watch for a noble cause.