Patek Philippe Ref. 5940
Ultra-thin self-winding perpetual calendar
A great classic reasserts its tradition
The ultra-thin self-winding Perpetual Calendar has ranked among Patek Philippe’s most popular complicated watches for many years. Now, the workshops are relaunching it in a format that emphasizes the brand’s heritage in perpetual calendars: the Ref. 5940 in an 18K-gold cushion-shaped case.
The new ultra-thin perpetual calendar Ref. 5940. With a length of 44.6 mm and a width of 37 mm, it features a very contemporary format with strong masculine appeal due to its modest height of merely 8.6 mm. The watch is delivered with a sapphire-crystal snap back, which allows the owner to observe the consummately finished movement at work, and with an interchangeable snap back in solid yellow gold.
The caliber 240 Q movement is composed of 275 individual parts, it is only 3.88 high, despite the fact that it is self-winding. The perpetual calendar always indicates the correct date, automatically taking into consideration the months with 31, 30, or 28 days, and the 29th of February in leap years. It does not need to be corrected until 2100, a secular year that omits the leap daypursuant to the rules of the Gregorian calendar. But this adjustment can be made quickly and easily, and thereafter, the watch will continue to display the correct date for the next 100 years, provided it remains wound without interruption. The moon-phase display is similarly accurate: it deviates from the true position of the moon by one day every 122 years, which is equivalent to a daily error of 0.002‰. And finally, the rate accuracy of the movement – responsible for timekeeping precision – is impressive as well. It ranges from -3 to +2 seconds per day as stipulated by the directives of the Patek Philippe Seal for all mechanical movements with diameters of over 20 mm.
This stunning rate accuracy is celebrated on a dial that deserves the attribute timelessly elegant in every respect. It has a grained, cream-colored surface that perfectly matches the gold hue of the case and is framed by a black transfer-printed railway-track minute scale that faithfully follows the contours of the bezel. Applied Breguet numerals as well as slender, leaf-shaped hands in gold indicate the time, accompanied by three subsidiary dials for the calendar displays. At 9 o’clock: the day of the week and the 24-hour dial. At 3 o’clock: the month and leap-year cycle. At 6 o’clock: the analog date and the moon phases.
All indications are well organized and crisply legible, as is customary at Patek Philippe. With its new Ref. 5940, Patek Philippe opens up a new chapter in perpetual calendars with the revival of the cushion-shaped case that looks as topical today as the 1920s and 1930s Art Deco showpieces in the Patek Philippe Museum that inspired it. The stately timepiece is worn on a matt black hand-stitched alligator strap with square scales and a prong buckle in 18K yellow gold.
Movement: Caliber 240 Q Ultra-thin self-winding mechanical movement. Perpetual calendar with analog displays for the date, day of the week, month, and leap-yearcycle. Moon phases.
Diameter – 27.50 mm
Height – 3.88 mm
Number of parts – 275
Number of jewels– 27
Power reserve – 48 hours
Winding rotor – Recessed 22K gold minirotor, unidirectional winding
Balance – Gyromax®
Frequency – 21,600 semi-oscillations per hour (3 Hz)
Balance spring – Spiromax®
Functions -Two-position crown, Pushed in: to wind the watch, Pulled out: to set the time
Displays – Center hour and minute hands
Subsidiary dials – Day of week and 24-hour dial at 9 o’clock, Month and leap-year cycle at 3 o’clock, Date and moon phases at 6 o’clock
Correctors – At 9 o’clock: day of week correction, Between 11 and 12 o’clock: date correction
Between 12 and 1 o’clock: month correction, At 6 o’clock: moon-phase correction
Setting stylus in ebony and 18K yellow gold delivered with the watch.
Hallmark – Patek Philippe Seal
Case – Cushion-shaped case in 18K yellow gold, cambered sapphire glass.
Sapphire-crystal snap back and interchangeable solid snap back in 18K yellow gold.
Water-resistant – to 30 meters
Case dimensions – Length x width 44.60 x 37.00 mm, Height: 9.25 mm (overall), Height: 8.5 mm (back to glass)
Width between lugs: 21 mm
Dial – Cream-colored, grained
Nine applied Breguet numerals in 18K yellow gold.
Leaf-shaped hour and minute hands in 18K yellow gold.
Day of week, month, and date hands in 18K yellow gold.
24-hour and leap-year-cycle hands in blued steel.
Strap – Alligator leather with square scales, hand-stitched, matt black, prong buckle in 18K yellow gold.