The combination of split-seconds chronograph and perpetual calendar has been a mainstay in Patek Philippe’s catalogue ever since the ref. 5004, but the brand’s latest take on the concept is unorthodox. The Split-Seconds Monopusher Chronograph Perpetual Calendar ref. 5373P-001 is described by Patek Philippe as designed for “left handers” and has its crown and pushers on the left side of the case.

Essentially an inverted version of the ref. 5372P that’s now discontinued, the ref. 5373P is the first “destro” timepiece among the brand’s regular production offerings, but the movement is classic Patek Philippe. Like the earlier versions of the model, the ref. 5373P is powered by the CHR 27-525 PS Q, a gorgeous, refined, and extremely slim movement that’s amongst the thinnest split-seconds chronographs ever made.

Initial thoughts

The ref. 5373P is paradoxical. It’s not majorly different from its predecessor, in fact it’s just a rotated case and new dial, but the watch looks and feels entirely different from the ref. 5372P. The left-handed case sets it apart, as does the high-contrast livery.

The black-and-red colour scheme seems mismatched to the elegant form of the watch – the case and movement are both impressively slim – but I can imagine this will have a strong appeal for someone seeking something different yet fundamentally classic Patek Philippe high horology.

This clearly stands out in the catalogue, offering an alternative that is recognisably different. The ref. 5373P is definitely not for everyone, but the movement is unquestionably fantastic (as is the retail price, which is expected for a Patek Philippe Grand Complication).

The ref. 5372P-001 with a blue dial that was launched in 2017. Image – Phillips

Sporty and slim

The case of the 5373P is identical to that of the ref. 5372P, except it’s been rotated 180 degrees. This leaves the crown and pushers in left-handed configuration, and the tiny diamond set into the case band (that indicates the case is platinum) is now at 12 o’clock instead of the usual six.

The dial of the ref. 5373P adopts the design of its right-handed predecessor, but with a rearranged layout to accommodate the 180-degree rotation of the movement.

The design is sportier than before, however, with the dial itself being a graduated dark grey with stark white markings. Additionally, the chronograph hands are bright red, giving this a more modern style than the average Patek Philippe Grand Complication.

The CHR 27-525 PS Q inside is both thin and compact, being inspired by a historical calibre found in a vintage Patek Philippe split-seconds chronograph wristwatch. It’s the more upscale of Patek Philippe’s split-seconds movements, with the larger,  thicker, and slightly more industrial movement being the CHR 29-535.

Though available as a rattrapante only, the CHR 27-525 base is mated with Patek Philippe’s classic perpetual calendar module. But underlining the movement’s thinness is the resulting height – the case is only 12.93 mm high despite combining two complications that add substantially to height.

Key Facts and Price

Patek Philippe Split-Seconds Monopusher Chronograph Perpetual Calendar for left handers
Ref. 5373P-001

Diameter: 38.3 mm
Height: 12.93 mm
Material: Platinum
Crystal: Sapphire
Water resistance: 30 m

Movement: CHR 27-525 PS Q
Functions: Hours, minutes, seconds, split-seconds chronograph, perpetual calendar
Winding: Manual wind
Frequency: 21,600 beats per hour (3 Hz)
Power reserve: 38-48 hours

Strap: Calfskin with platinum clasp

Limited edition: No
Availability: Now at boutiques and authorised retailers
Price: CHF505,000 including taxes

For more information, visit Patek.com.