In 2011 Patek Philippe endowed its patented Annual Calendar mechanism with a regulator style display featuring a sweep minute-hand and subsidiary dials for the hours and seconds at 12 o’clock and 6 o’clock respectively. The design paid tribute to the precision clocks that were long used to display the exact time in watchmaking workshops and astronomical observatories. It was launched as Ref. 5235, in a white-gold case framing a two-tone silvery gray dial with a vertical satin finish.
Now the manufacture has given a new face to its Annual Calendar Regulator by presenting it in rose gold, its two-tone dial in graphite and ebony-black with a vertical satin finish and white transfer-printed indications.
This highly original design, enriched by the rose-gold baton-style hands, is again reminiscent of the old regulators. It accentuates its elegant technical air with three railway-track scales, one each for the main dial and the subsidiary hour and seconds dials. The Annual Calendar displays the day, the month and the date in three generous apertures, automatically taking account of months of 30 and 31 days. It therefore requires correction only once a year, on March 1st.
The caliber 31-260 REG QA self-winding movement, developed for this model, is notable for its frequency of 23,040 semi-oscillations per hour (3.2 Hz) and its high-tech regulator incorporating a Pulsomax® escapement and a Spiromax® balance spring in Silinvar® – both developed by the “Patek Philippe Advanced Research” department.
The minirotor in 22K gold adorned with circular Geneva striping, together with all the other finely decorated parts, may be admired through the sapphire-crystal case back.
The only watch in the Patek Philippe collection featuring a regulator style display, the new Ref. 5235/50R-001 in rose gold is worn on a hand-stitched alligator strap with large square scales, whose matte black color echoes that of the dial. It replaces the previous white-gold model.
Two-tone graphite and ebony black, vertical satin finish, white transfer-printed
White lacquered white gold baton-style hands
Diameter: 40.5 mm
Height: 10 mm
Water-resistant to 30 m
Sapphire crystal case back
Alligator leather with square scales, hand-stitched, matte black
Caliber 31-260 REG QA
Regulator-style display: hour and seconds subdials, sweep minutes
Day, date, month displayed in apertures
Diameter: 33 mm
Height: 5.08 mm
Number of parts: 313
Winding rotor: oﬀ-center minirotor in 22K gold
Frequency: 23,040 semi-oscillations/hour (3.2 Hz)
Escapement: Pulsomax® with lever and escape wheel in Silinvar®
Power reserve: min. 38 hours – max. 48 hours
Large central minute hand
Subsidiary dials: Small hour hand and Small seconds
Apertures: Day of the week, Date and Month
5235G-001(2011): Discontinued in 2019