Patek Philippe 5270R Grand Complication Perpetual Calendar Chronograph with Moonphase in 18kt Rose Gold with rare "Oplain Veloute" dial with tachymeter scale. The chronograph movement, with its classic architecture - horizontal clutch, column wheel and manual winding - features six patented innovations. Fitted on a hand-stitched matte brown alligator strap with square scales and 18kt rose gold fold-over deployant buckle - rare special model.

The solid two-body case, stepped concave bezel and fluted lugs are polished. It has a sapphire crystal as well as a screw-down sapphire display case back, an alternative snap-on solid case back, and correctors in the band. The dial is satin silver with applied faceted rose gold baton hour index markers and feuille hands, and a central chronograph hand. There are rectangular chronograph pushers and a subsidiary seconds dial at 9 o’clock, with a moonphase and days-of-the-month aperture at 6 o’clock. There is a 30-minute register at 3 o’clock, and a leap-year indicator window between 4 and 5 o’clock. Included are an outer 1/5-seconds and tachymeter track, a minute track, and a day/night indicator between 7 and 8 o’clock. It has a 55 to 65-hour power reserve with the chronograph disengaged, is water resistant to 30 meters, and the case, dial and movement are all signed.

This Patek Philippe Perpetual Calendar Chronograph 5270R-001 has a Patek Philippe manual-winding caliber CH 29-535 PS Q movement that is rhodium plated with fausses cotes embellishment and the Patek Philippe quality seal. It is constructed with 33 jewels, 456 components, a shock-absorber mechanism, and a Gyromax balance that is adjusted to heat, cold, isochronism and 5 positions. It includes a self-compensating free-sprung Breguet balance spring and a straight-line lever escapement. The mechanism oscillates at a frequency of 28,800 vph (4 Hz).

One cannot discuss a perpetual calendar chronograph from Patek Philippe without mentioning the potential long-term collectability of a particular reference. The complication has been in Patek Philippe’s catalog since 1941, and it is also one of the brand’s most important watches. Vintage or modern, Patek’s perpetual calendar chronographs are among the most coveted and collectible of all wristwatches.