Patek Philippe Nautilus Annual Calendar · Reference 5726A-001
Patek Philippe Nautilus Annual Calendar 5726A-001
Known as Nautilus Annual Calendar
The 5726A-001 is the watch that put a real complication inside a steel Nautilus. Patek introduced it in 2010 as the first Nautilus with the annual calendar, the house's own patented complication that tracks the length of every month except February and needs a single correction each year, on March 1. That gave collectors a Nautilus that showed day, date, and month across three apertures, plus a moon phase and 24-hour indicator in the subdial at 6 o'clock, all in a 40.5mm porthole case that still wears like a sports watch. The A in 5726A designates the strap version in acier, French for steel, and it is the one you buy on a strap rather than the integrated steel bracelet of the 5726/1A. The dial is the detail people underrate: a sunburst charcoal gray center with a black-gradient rim and the horizontal Nautilus grooves, so it reads black at a glance and shows depth up close. This is the sensible-complication Nautilus, more watch than a Travel Time, less of a unicorn than a 5711, and it has quietly become one of the more collectible steel Pateks of the last fifteen years.
Produced: Introduced in 2010 and still catalogued by Patek Philippe as a current-production strap model. The steel-bracelet siblings tell the rest of the story: the black-dial 5726/1A-001 and white-dial 5726/1A-010 were discontinued around 2019, replaced by the sunburst-blue 5726/1A-014. The strap-mounted 5726A-001 has run continuously since launch, which makes it one of the longest-lived steel Nautilus references still in the book.
In stock at Ultimate Diamond
3 pieces on the counter right now.
Specifications
- Reference
- 5726A-001
- Model
- Nautilus Annual Calendar
- Case material
- Stainless steel
- Case diameter
- 40.5mm
- Lug to lug
- 45.0mm
- Case thickness
- 11.3mm
- Crystal
- Sapphire crystal front
- Caseback
- Sapphire crystal display back, screwed
- Dial
- Sunburst charcoal gray center with black-gradient rim, horizontally embossed Nautilus grooves, applied luminous gold hour markers and hands
- Complications
- Annual calendar with day, date, and month apertures; moon phase; 24-hour indicator
- Movement
- Automatic, in-house Patek Philippe
- Caliber
- 324 S QA LU 24H/303
- Power reserve
- 35 to 45 hours
- Frequency
- 28,800 vibrations per hour (4 Hz)
- Jewels
- 34 jewels
- Rotor
- Central rotor in 21K gold
- Seal
- Patek Philippe Seal
- Water resistance
- 30 meters
- Strap
- Delivered on matte black hand-stitched alligator with a folding clasp, plus an additional black composite strap
- Year introduced
- 2010
Market & Value
This is a steel Patek complication, so it trades well above list. We track the 5726A-001 in the roughly $52,000 to $110,000 band on the secondary market depending on year, condition, and whether it is full set with both straps, both books, and the original certificate. Clean examples with box and papers cluster in the middle of that range; incomplete or heavily worn pieces sit at the low end, and fresh, unworn recent-production watches pull the top. Two things move the number on this reference specifically: completeness, because the composite second strap and the original certificate are routinely missing and buyers pay up for a genuinely full set, and freshness of the stamped booklet, since a recent purchase date reassures the next owner. Against the bracelet 5726/1A-014, the strap A-model typically trades softer, which is exactly why it is the value entry into a complicated steel Nautilus. Prices settled off the 2021 to 2022 peak and have been steadier since, but this remains a watch that changes hands for multiples of what the retail counter charges.
What to Know Before You Buy
The annual calendar is the whole point, so buy it working. Set it correctly and it only needs one adjustment a year, but a mechanism that fights you between the apertures wants a watchmaker's eye before money changes hands; correcting the calendar outside the safe window can damage it, so let it run and verify the day, date, and month all advance cleanly at midnight. Confirm the caliber 324 S QA LU 24H/303 through the sapphire back and check that the 21K gold rotor spins freely. On the dial, look for the sunburst charcoal center and the horizontal grooves; a flat, dead-black dial is a red flag for a swapped or refinished part. The strap matters here more than on most Pateks: the watch shipped with both an alligator strap and a black composite strap, and a set missing the composite or the deployant is not a full set, no matter what the seller calls it. Steel cases on this reference are usually lightly polished from wear; sharp, unmolested case lines and intact brushing add real money. Papers, the sealed certificate, the setting pin, and both booklets are worth chasing. And know your dial variant: the strap 5726A-001 is the charcoal-gray car, distinct from the discontinued bracelet 5726/1A-001 and the current blue-dial 5726/1A-014.
Buying or selling a 5726A-001?
We buy and sell the Nautilus 5726A-001 at Ultimate Diamond, 19 W 47th Street, and we have been on this block since 1959. We write real checks for steel Nautilus complications every week, so when you bring in a 5726A we are pricing the actual watch in front of us: the completeness of the set, the sharpness of the case, the condition of both straps, and whether the calendar runs the way it should. If you are selling, bring the watch, both straps, the box, and the certificate and we will make you a firm cash offer on the spot. If you are buying, tell us the dial and the year you want and we will source a clean, verified example rather than talk you into whatever is sitting in the case. Bring it in, or call us before you sell anywhere else.