Patek Philippe Ref. 5905/1A-001 Self-Winding Flyback Chronograph with Annual Calendar

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.

Technical specifications: 

Patek Philippe Self-winding Flyback Chronograph with Annual Calendar

Reference: 5905/1A-001

Case

• Material: Steel
• Diameter: 42mm
• Height: 14.13mm
• Sapphire crystal case back
• Water-resistant to 30 meters

Dial and hands

• Olive green sunburst, gold applied hour markers
• White gold faceted dauphine hands with luminescent coating

Movement

• Caliber CH 28-520 QA 24H • Self-winding  
• Diameter: 33mm
• Height: 7.68mm
• Number of parts: 402
• Winding rotor: 21K gold central rotor
• Frequency: 28,800 vph (4Hz)
• Power reserve: min. 45 hours - max. 55 hours

Functions/Indications

• Hour, minutes, seconds
• Flyback chronograph
• Central chronograph hand
• 60-minute counter
• Annual Calendar
• Day, date, month and day/night indication displayed in apertures

Strap and buckle

• Steel bracelet
• Fold-over clasp

MSRP: EUR 51'500

For more information, please visit patek.com