Patek Philippe self-winding flyback chronograph with Annual Calendar Reference 5905/1A-001


Patek Philippe self-winding flyback chronograph with Annual Calendar Reference 5905/1A-001

Self-winding flyback chronograph with Annual Calendar
Reference 5905/1A-001

A resolutely sporty version in steel with an integrated bracelet and a sunburst green dial
La Cote des Montres - October 14th, 2021

Patek Philippe introduces three new versions of chronographs with additional complications

The Manufacture is expanding its vast selection of chronographs by unveiling three variations of the 5204, 5905 and 5930 models that illustrate its expertise in the field of complications, particularly in the measurement of short times.

The chronograph has always played a leading role amid the vast repertoire of Patek Philippe complicated watches. Since 2005, the Manufacture has confirmed this mastery by developing a complete range of chronograph movements, with or without additional functions, entirely designed and crafted in its workshops.

The starting point was caliber CHR 27-525 PS, the world’s thinnest split-seconds chronograph movement presented in 2005.

Introduced in 2006, caliber CH 28-520 – the second “in-house’” chronograph movement – features automatic winding, a modern vertical disk-type clutch system, a flyback function, a large single counter at 6 o’clock and a chronograph seconds hand that can be used as a permanent (running) seconds hand. It can be combined with additional complications, as is the case with the two new models: 5905/1A (chronograph and Annual Calendar) and 5930P (chronograph and World Time).

Launched in 2009, caliber CH 29-535 PS – the third exclusive chronograph movement – combines traditional architecture (manual winding, column wheel, toothed-wheel horizontal clutch system) with six patented innovations. In the current collection, it powers a men’s model (Reference 5172) and a ladies’ model (Reference 7150/250). In 2011, this base caliber was interpreted in a Grand Complication version incorporating a perpetual calendar (CH 29-535 PS Q), present on the 5270 and 5271 models. Since 2012, it can also be found on Reference 5204 in a split-seconds chronograph and perpetual calendar version (CHR 29-535 PS Q).

The various Patek Philippe chronograph calibers are offered in the current collection in more than 20 variations – to which three new, resolutely contemporary interpretations have now been added.


Patek Philippe
self-winding flyback chronograph
with Annual Calendar

Reference 5905/1A-001 

Launched as a platinum model in 2015, then in rose gold in 2019, Reference 5905 combines two practical and easy-to-use complications: a self-winding flyback chronograph and a patented Annual Calendar. The Manufacture is reinterpreting the style of this much sought-after model by unveiling a first version in steel – a rare metal in the Patek Philippe collections – with a three-link integrated bracelet. This bold and casual design renews the way a Patek Philippe complication watch is worn on a daily basis.

The extremely rhythmical dial features a new elegant and contemporary sunburst olive green color. It ensures excellent legibility for the additional functions, with a central chronograph hand, a large 60- minute subdial at 6 o’clock and three day/date/month apertures arranged in an arc for instant reading of the Annual Calendar indications. There is also a discreet day/night indicator at 6 o’clock that is useful for ensuring accurate date setting.

Visible through the transparent sapphire caseback, caliber CH 28-520 QA 24H remains faithful to the traditional column wheel for the transmission of chronograph commands. However, instead of a toothed-wheel horizontal clutch, it has a vertical disk-type clutch. This modern technical solution causes almost no wear and tear, and the central chronograph seconds hand can also be used as a permanent (running) seconds display. The patented Annual Calendar automatically takes account of 30- and 31-day months, requiring only one correction per year, on March 1st.

The polished steel case features a sophisticated construction with a concave bezel and recessed sides. The integrated steel bracelet is inspired by that of the Aquanaut Reference 5167/1A with its contrasting finishes (polished outer links and satin-finish inner links), while subtly distinguished from it by the underside of the bracelet and the edges which are polished, in line with the case. It is equipped with a patented Patek Philippe fold-over clasp secured by four independent catches.

The new Reference 5905/1A-001 is joining existing References 5905P-001 in platinum with a blue dial and 5905R-001 in rose gold with brown dial.


Patek Philippe self-winding flyback chronograph
with Annual Calendar
Reference 5905/1A-001

Technical characteristics

Dial :Olive green sunburst
Gold applied hour markers
White gold faceted dauphine hands with luminescent coating
Case :Polished steel
Diameter :42 mm
Height :14.13 mm
Water-resistant :To 30 m
Case back :Sapphire crystal
Movement :Self-winding CH 28-520 QA 24H caliber, flyback chronograph with Annual Calendar
Flyback chronograph with vertical clutch and 60-minute counter
Central chronograph hand
Annual Calendar indications displayed along an arc
Annual Calendar mechanism requiring adjustment only once a year (invented and patented by Patek Philippe in 1996)
Day, date, month and day / night indication displayed in apertures
Diameter :33 mm
Height :7.68 mm
Number of parts :402
Winding rotor :21K gold central rotor
Frequency :28,800 semi-oscillations / hour(4 Hz)
Power reserve :Min. 45 hours - max. 55 hours
Displays :Hour hand
Minute hand
Chronograph hand (sweep seconds)
Subsidiary dial :60-minute counter
Apertures :Day of week
Day / night indication
Two-position crown :Pushed in: to wind the watch
Pulled out: to set the time
Pushers :Chronograph start and stop
Chronograph reset and flyback function
Correctors :Day-of-week correction
Date correction
Month correction
Bracelet :Integrated steel with contrasting polished and satin finishing
Buckle :Patented Patek Philippe fold-over clasp secured with four independent catches