- Year
- 2026
- Condition
- Unworn
- Set
- Box and papers
- Movement
- Self-winding
- Size
- 39.9 mm
Set and condition
Complete set
This Aquanaut Annual Calendar, Moon Phases is accompanied by its original presentation box, warranty card and supporting documentation. The watch and included items are inspected by an expert watchmaker before sale. Additional photographs and video of this piece are available on request.
Original presentation box
Original presentation box and packaging.
Original papers
Warranty card and supporting documentation.
Inspected prior to sale
Reviewed for condition, completeness and functionality. Additional details and photographs are available on request.
Condition photography
Additional close-up images of specific areas are available before purchase.
Overview
An Annual Calendar in the Aquanaut case
The Patek Philippe Aquanaut Annual Calendar, reference 5261R-001, in rose gold with an opaline blue-grey dial and embossed Aquanaut pattern, on a blue-grey composite strap. Self-winding calibre 26-330 S QA LU with day and month by hands, date in an aperture and moon phases; 39.9 mm from 10 to 4 o'clock, 10.94 mm high.
The reference 5261R-001 is the Aquanaut Annual Calendar with moon phases in rose gold, which Patek Philippe presents as the first Annual Calendar in the Aquanaut collection. It carries a complete day, date and month calendar with the moon phases, on an opaline blue-grey dial with the embossed Aquanaut pattern, matched by a blue-grey composite strap with a rose gold patented fold-over clasp. The case is 39.9 mm from 10 to 4 o'clock and 10.94 mm high, finished in contrasting polished and satin surfaces, with a sapphire crystal back.
The calibre 26-330 S QA LU is self-winding, 32 mm across and 5.32 mm high, with 319 parts and 34 jewels, wound by a 21K gold central rotor. The Annual Calendar is a mechanism Patek Philippe says Patek Philippe invented and patented: it follows the months of differing length on its own and needs only one manual correction a year, at the end of February. The day is read at 3 o'clock and the month at 9 o'clock by hands, in what Patek Philippe calls an inverted display, with the moon phases at 12 o'clock and the date in an aperture at 6 o'clock. It beats at 28,800 semi-oscillations an hour on a Gyromax® balance with a Spiromax® balance spring, for a power reserve of 35 to 45 hours, and carries the Patek Philippe Seal.
For collectors
Patek Philippe's own measure of the reference is that it is the Aquanaut collection's first Annual Calendar, and its layout — day and month by hands at 3 and 9 o'clock, the moon at 12, the date at 6 — is what Patek Philippe calls an inverted display, the calendar hands sitting where a chronograph would put its counters.
Key details
Design and engineering
- Annual CalendarDay at 3 o'clock and month at 9 o'clock by hands, the date in an aperture at 6 o'clock and the moon phases at 12 o'clock; the mechanism needs one correction a year, at the end of February, which Patek Philippe presents as the point of the complication.
- Case39.9 mm from 10 to 4 o'clock and 10.94 mm high, in contrasting polished and satin finishes; sapphire crystal back, water-resistant to 30 m.
- DialOpaline blue-grey with the embossed Aquanaut pattern; applied rose gold numerals and rose gold baton-style hands, all with white luminescent coating.
- Strap and claspBlue-grey composite material with the Aquanaut pattern, integrated into the case and closed by a rose gold patented fold-over clasp.
Calibre 26-330 S QA LU
- Self-winding, 21K gold central rotor
- Annual Calendar: day and month by hands, date in an aperture, moon phases; sweep seconds
- 32 mm across, 5.32 mm high; 319 parts, 34 jewels
- 28,800 semi-oscillations per hour (4 Hz), Gyromax® balance, Spiromax® balance spring
- Power reserve 35 to 45 hours
- Patek Philippe Seal
The reference
Technical specifications
| Reference | 5261R-001 |
|---|---|
| Collection | Aquanaut |
| Calibre | Caliber 26-330 S QA LU |
| Movement | Self-winding |
| Functions | Annual Calendar, Day and month by hands, Date in an aperture, Moon phases, Sweep seconds |
| Case dimensions | 39.9 mm |
| Case thickness | 10.94 mm |
| Case material | Rose gold |
| Case back | Sapphire crystal case back |
| Water resistance | 30 m |
| Dial | Opaline blue-gray, embossed Aquanaut pattern, rose gold applied numerals with white luminescent coating |
| Strap | Composite material, blue-gray |
| Clasp | Rose gold patented fold-over clasp |
| Jewels | 34 |
| Power reserve | min. 35 hours – max. 45 hours |
| Frequency | 28,800 semi-oscillations/hour (4 Hz) |
Buying with HYPA
Purchase with confidence
- Original warranty card included, dated 2026
- Free insured delivery within Australia · international quoted
- Payment by bank transfer
- Registered Australian dealerHYPA International Pty Ltd · Registered Victorian second-hand dealer, Registration No. SHD-0018017.
- Direct specialist supportSpeak with the HYPA team before, during and after the purchase.
- Rated 5.0 on Google · 6 reviewsFrom clients of HYPA International on Google. Read the reviews
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