Patek Philippe Annual Calendar Flyback Chronograph 5905/1A-001
Record status
Individual type · partial
Period
2020s
Maker / issuer
Patek PhilippeThis Patek Philippe wristwatch, reference 5905/1A-001, is a complex mechanical timekeeper featuring both an annual calendar and a flyback chronograph. The watch is powered by the automatic Calibre CH 28-520 QA 24H, which is visible through a sapphire crystal case back.
Housed in a 42 mm stainless steel case, the design includes a signed crown and square pushers, matched with a stainless steel bracelet. The green dial features applied indices, white minute tracks, and luminescent obelisk hands, with apertures for day, date, and month, alongside a sub-dial at the six o'clock position for the chronograph seconds. The annual calendar mechanism is designed to account for varying month lengths, requiring manual adjustment once a year at the end of February.
The watch is presented as being complete with all factory accessories and is attributed to production in the 2020s.
Evidence at a glance
- Linked sources
- 1
- Photograph views
- 1
- Catalogue references
- 0
Counts describe this entry’s documentation, not authenticity, rarity or completeness. Photographs may show one specimen; check each caption and licence.
Technical characteristics
- Type
- Annual Calendar Flyback Chronograph
- Maker
- Patek Philippe
- Movement
- Calibre CH 28-520 QA 24H
- Reference
- 5905/1A-001
- Case Diameter
- 42 mm
- Case Material
- Stainless steel
- Place recorded
- Switzerland
- Production Period
- 2020s
- Maker / attribution
- Patek Philippe
Design
- Visible features
- • Signed winding crown • Three calendar apertures at top of dial • Chronograph sub-dial at 6 o'clock • Square chronograph push-pieces
- Case and Dial Design
- The timepiece is encased in a 42 mm stainless steel housing, finished with a polished concave bezel. It features a notable green dial, which acts as a backdrop for applied indices and luminous obelisk-style hands. The dial layout provides data for the annual calendar via three apertures placed horizontally across the upper section of the face, indicating the day, date, and month. In addition to the time and calendar functions, the dial incorporates a sub-dial situated at the six o'clock position, which serves as the chronograph's running seconds. A white minute track encircles the outer edge of the dial, and the watch is completed with a steel bracelet. The case back is fitted with a sapphire crystal viewing window, allowing for observation of the internal mechanism.
- Movement and Complications
- The watch utilizes the automatic Patek Philippe Calibre CH 28-520 QA 24H movement. This movement integrates two distinct functions: an annual calendar and a flyback chronograph. The annual calendar is a technical feature developed by the brand that automatically adjusts for months with 30 or 31 days, necessitating a single manual correction per year at the end of February. The inclusion of the flyback chronograph allows the user to stop, reset, and start the chronograph function instantly using a single pusher.
- Provenance and Accessories
- According to the source documentation, the watch is supplied with all original factory accessories. It is considered a representative example of the brand’s production during the 2020s, combining technical complexity with stainless steel construction. The information provided serves as a catalogue record based on the secondary market listing.
Identification
- Reference
- 5905/1A-001
- Source note
- Facts transcribed from the linked source listing or collection record. Attribution and specifications are source-reported and have not been independently authenticated.
Catalogue references
No catalogue numbers recorded. Numbers are only published once transcribed from a verified edition of a standard catalogue — they are never inferred.
Research required
- Research required: Movement condition not verified by the source
- Research required: Exact production year within the 2020s not specified