Patek Philippe Nautilus Annual Calendar with Moon Phases Ref. 5726/1A-014, Steel Case and Blue Dial

In 2010, Patek Philippe united sporting spirit and technical sophistication in a Nautilus watch for men endowed with an Annual Calendar, a moon-phase display and a 24-hour indicator. This Ref. 5726A in steel on a leather strap has since been joined by others with a steel bracelet.

Now the manufacture is reinterpreting that steel-bracelet version by fitting it with an elegant blue dial (the color on the original Nautilus model of 1976). The horizontal embossing and the subtle shading from blue to black at the dial’s periphery create a powerful but refined decor that complements the sheen of the steel.

The hours and minutes are indicated with applied white-gold hour markers and hands highlighted with a luminescent coating, accompanied by a slender sweep seconds hand.

This elegantly sporty exterior, water-resistant to 120 m, conceals a caliber 324 S QA LU 24H/303 self-winding movement comprising 347 parts.

The Annual Calendar, patented by Patek Philippe in 1996, displays the day and the month in two in-line apertures at 12 o’clock and the date in an aperture at 6 o’clock.

Thanks to this ingenious mechanism, which takes account of months of 30 and 31 days, the date requires correction only once a year, on March 1st. The 24-hour indicator in the lower half of the dial simplifies calendar adjustments. This subsidiary dial also houses the extremely precise moon-phase display, which requires correction by one day every 122 years.

Like the case and bezel, the steel bracelet with fold-over clasp boasts a pronounced contrast between polished and satin finishes.’

The new Ref. 5726/1A-014 complements the version with leather strap and black gradient dial. The previous models with a steel bracelet and a white or a black gradient dial are being discontinued.

Technical details

Movement
Caliber 324 S QA LU 24H/303
Self-winding
Annual Calendar
Day, date, month displayed in apertures
Moon phases
24-hour indication
Sweep seconds
Diameter: 33.3 mm
Height: 5.78 mm
Number of parts: 347
Winding rotor: central rotor in 21K gold
Frequency: 28,800 semi-oscillations/hour (4 Hz)
Power reserve: min. 35 hours – max. 45 hours

Displays
Hour hand
Minute hand
Second hand
Subsidiary dial: 24-hour indication
Apertures: Day of the week, Date, Month and Moon phases

Correctors
Day-of-week correction
Date correction
Month correction
Moon-phase correction

Dial
Blue, black gradated, gold applied hour markers with luminescent coating
White gold baton-style hands with luminescent coating

Case
Steel
Diameter (10 – 4 o’clock): 40.5 mm
Height: 11.3 mm
Water-resistant to 120 m
Screw-down crown
Sapphire crystal case back

Bracelet
Steel
Nautilus fold-over clasp

Previous Models
5726A-001 (2010)
5726/1A-001(2012): Discontinued in 2019
5726/1A-010(2012): Discontinued in 2019

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