Launched in platinum in 2015, Ref. 5905 unites two Patek Philippe complications beloved of connoisseurs: a self-winding flyback chronograph and a patented Annual Calendar.
The manufacture is now enriching its collection with a new version of this model in a rose gold case with a brown sunburst dial shading gently to black at the periphery.
The dial’s design combines the technical look of an instrument for measuring short times with the timeless elegance of a Patek Philippe.
It features three-face Dauphine hour and minute hands with a luminescent coating, rose-gold applied hour-markers, and luminous dots marking the five-minute points.
The sandblasted sweep seconds-hand counts the seconds for the chronograph, while the large subsidiary dial at 6 o’clock totalizes the minutes from 1 to 60. The three apertures for the day, the date and the month are arranged along an arc with a day/ night indicator.
Within this timepiece beats the caliber CH 28-520 QA 24H selfwinding movement, comprising 402 parts.
The Annual Calendar, based on the Patek Philippe patent of 1996, automatically takes account of months of 30 and 31 days and requires correction only once a year, on March 1st.
The chronograph remains true to the traditional column wheel for transmission of the start, stop and reset commands. But instead of the horizontal wheel clutch it uses a vertical disk clutch.
Since this solution is virtually friction-free, the center chronograph hand can also serve as a permanently running seconds hand without affecting the rate accuracy of the movement. That is why Patek Philippe decided not to include the usual small seconds dial in its self-winding chronograph models.
The new Ref. 5905R-001 takes its place alongside the existing models in platinum with blue or black dials (references 5905P-010 and 5905P-001).
Model: Patek Philippe Annual Calendar with Flyback Chronograph Ref. 5905R-001, Rose Gold Case and Brown Sunburst Dial
Brown sunburst, black gradated, gold applied hour markers
Rose gold three-face Dauphine hands with luminescent coating
Diameter: 42 mm
Height: 14.03 mm
Water-resistant to 30 m
Sapphire crystal case back
Alligator leather with square scales, hand-stitched, shiny black
Caliber CH 28-520 QA 24H
Central chronograph hand
Day, date, month, day/night indication displayed in apertures
Diameter: 33 mm
Height: 7.68 mm
Number of parts: 402
Winding rotor: central rotor in 21K gold
Frequency: 28,800 semi-oscillations/hour (4 Hz)
Power reserve: min. 45 hours – max. 55 hours
Chronograph hand (sweep seconds)
Subsidiary dial: 60-minute counter
Apertures: Day of the week; Date; Month and Day/night indication
Chronograph start and stop
Chronograph hand reset and ﬂyback