Patek Philippe. A fine and extremely rare PT950 platinum diamond perpetual calendar wristwatch with chronograph
Ref. 3990P, Movement No. 3046782, Circa 2000
24-jewel, Cal. CH27-70 Q, straight-line lever escapement, gyromax balance adjusted to heat, cold, isochroniam and 8 positions, shock absorber, self-compensating balance spring, with seal of Geneva, black dial with diamond-set indexes, 1/5 second outer ring, subsidiary dials for 30-minute register combined with leap year at 3, date combine with moon phase aperture at 6, and seconds combined with 24-hour indication at 9, apertures for day and month at 12, polished baton hour, minute and chronograph hands, PT950 platinum case, bezel set with baguette diamonds, sapphire crystal, screw down transparent case back, leather strap with original PT950 platinum buckle, together with box, certificate and extra case back, case, dial and movement signed 36mm.