IWC. A Limited Edition 18K rose gold automatic calendar wristwatch with 7 day power reserve Big Pilot's Watch 'Le Petit Prince', Ref IW5009-09, No.246/250, Circa 2015IWC. A Limited Edition 18K rose gold automatic calendar wristwatch with 7 day power reserveModel: Big Pilot's Watch 'Le Petit Prince'Reference: IW5009-09, No.246/250Date: Circa 2015Movement: 42-jewel Cal.51111 automatic, No.3950990Dial: Sunburst blue, applied luminous Arabic numeral hour markers, white outer 1/5th second divisions with Arabic numeral 5 minute markers, date aperture at 3, 7-day power reserve at 3, polished dagger hands with luminous inserts, centre seconds Case: Brushed and polished tonneau form, screw down back, No.6008498Strap/Bracelet: Brown IWC leatherBuckle/Clasp: Signed 18K rose gold folding claspSigned: Case, dial & movementSize: 46mmThe origins of the Big Pilot watch can be traced back to 1940 when IWC produced 1000 military navigators watches known as the 'B-Uhr'. These watches were a colossal 55mm in diameter with highly legible dials, and featured pocket watch movements converted to central seconds.For several years IWC has released a limited edition watch to raise money for the 'Antoine de Saint-Exupéry Youth Foundation'. Named after the noted French author Antoine de Saint-Exupéry who is best remembered for his novella The Little Prince (Le Petit Prince).