PATEK PHILIPPE Perpetual Calendar, Ref. 3940P, movement no. 3125397, case no. 4130933, made in 2002 and sold in February 2003 A very attractive and rare, water-resistant, automatic, platinum perpetual calendar wristwatch with opaline-white dial, applied gold indexes, gold Dauphine hands, moon phases, 24-hour and leap year indication, leather strap and platinum Patek Philippe folding clasp. Fitted with a cal. 240Q, rhodium-plated, self-winding, 27 jewels, 22K gold micro rotor, stamped with the Seal of Geneva, Gyromax balance, shock absorbers. Snap on plain platinum case back, correctors in the band, sapphire crystal. Dial, case and movement signed. Diam. 36 mm. Thickness 8.20 mm. Accompanied by a fitted red Patek Philippe leather presentation box with winding facilities, an Extract from the archives, a wooden and gold setting pin. Reference 3940 was introduced in 1985 to replace reference 3450; production ceased in 2007. This was Patek Philippe’s first perpetual calendar with micro-rotor winding, thanks to its caliber 240 Q. The rarest version - the platinum models - were delivered only with the plain snap on case back, whereas the other case versions were available with both solid and glazed back. Reference 3940 is illustrated in Patek Philippe Wristwatches by Martin Huber & Alan Banbery, second edition, pages 292 - 293.