Case material: Yellow gold; Charge: Manual; Conditions: Used Year : 1999; Presentation condition : With dealer guarantee ; Model: Grand Complications Perpetual Price on request Gmtbroker Reference: 3970E An 18k Yellow Gold Perpetual Calendar Chronograph Gents Wristwatch, opaline silver dial with applied hour markers , 30 minute recorder and leap year indicator at 3 0'clock, date sub-dial and moonphase aperture at 6 0'clock, small seconds and 24 hour sub-dial at 9 0'clock, day and month apertures at 12 0'clock, a fixed 18k yellow gold bezel, an original brown leather strap with an original 18k yellow gold deployant clasp, sapphire glass, exhibition caseback, additional 18k yellow gold caseback, manual wind movement, in excellent condition, comes complete with an original Patek Philippe box, an original  18k yellow gold pusher  and papers dated December 1999. N.B. Since its initial introduction in 1986 to its end in 2004, there have been 3 series of the 3970: First series:  An estimated run of only 100 watches, all in 18k yellow gold. It featured leaf shaped hands, applied hour markers, sub-dials that were slightly off colour and a snap caseback.  This series is considered extremely rare. Second series:  Produced approximately between 1987 to 1990, there are two variations to this series;  The first variation visually look similar to the first series, although the sub-dial were now textured as opposed to a different colour. The main difference was the solid screw caseback, making the watch water resistant.  It was later on, through t