Patek Philippe 5370P Split-Second Chronograph

The Patek Philippe 5370P Split-Second Chronograph is a new addition to the brand’s portfolio. Its specification is of the highest order. The  Calibre CHR 29-535 PS is a hand-wound movement featuring a column wheel and horizontal coupling. The model, presented in a 41mm platinum case, also includes a rattrapante and a grand feu enamel dial.

The Patek Philippe 5370P Split-Second Chronograph is a new model for 2020 and is endowed with a plethora of delightful details.

A split-seconds chronograph, sometimes referred to as a ‘rattrapante’, is an incredibly complex complication. The chronograph features two central chronograph seconds hands, one superimposed over the other. When the chronograph hand is actuated both hands run in tandem, appearing as one.

Patek Philippe 5370P Split-Second Chronograph

Should the wearer choose to measure two events simultaneously, they can actuate the split seconds function, often with an additional pushpiece located at 10 o’clock. Unlike a conventional chronograph, the wearer can also record split times. When required, the wearer can reunite both hands merely by pressing the split seconds pusher again.

Patek Philippe 5370P Split-Second Chronograph

In order to avoid a parallax error, the two chronograph seconds hands are positioned very close to each other. This, along with the split seconds hand catching up with the chronograph hand, are just a couple of the technical challenges facing a watch company.

In this instance, Patek Philippe has rejected the idea of placing a pushpiece at 10 o’clock, preferring to locate the split seconds pusher within the crown. The resultant design proves much neater. There are numerous additional details which enrich the specification of the movement.

The Calibre CHR 29-535 PS is a hand-wound movement featuring a column wheel and horizontal coupling. Consistent with Patek Philippe tradition, the column wheel is covered with a polished cap.

Patek Philippe 5370P Split-Second Chronograph

The movement also features the brand’s Gyromax system, a variable inertia balance, which includes a hairspring equipped with a Breguet Overcoil. This combination ensures the hairspring breathes more concentrically, aiding precision.

Consistent with Patek’s esteemed reputation, the finishing is exemplary with numerous bevelled edges, black polished screw heads and grained bridges. One of the endearing aspects of this movement is the brand’s rejection of modern-style bridges in favour of traditional bridges that disclose numerous decorated parts.

Patek Philippe 5370P Split-Second Chronograph

Lastly, the Genevan Maison has enriched the model’s specification still further by pairing a blue grand feu enamel dial with a 41mm platinum case.

The brand’s press release

Presented in 2015, Patek Philippe’s first split-seconds chronograph based on the proprietary calibre CHR 29-535 PS in a classic configuration was the Ref. 5370 with a platinum case and a black enamel dial. This coveted grand complication has now been updated with a new blue face that revisits Patek Philippe’s storied tradition in Grand Feu enamel dials. The dial colour of the compact hand-crafted masterpiece in 18K gold is incomparably intense and refined with a glossy finish.

Patek Philippe 5370P Split-Second Chronograph

Its legibility is outstanding, as befits the class of a technical instrument. The hours and minutes are clearly and crisply indicated by extended leaf-shaped hands with luminous coatings and applied Breguet numerals in white gold. Stopped times are just as precisely and quickly readable thanks to the slender chronograph and rattrapante hands from the centre, the instantaneously jumping 30-minute- counter hands in white gold and the white printed chronograph scales that contrast well against the blue enamel.

The two-phase chronograph movement features two pushers for the three classic chronograph functions and a pusher in the crown to start and stop the rattrapante hand – a perfect combination of tradition and innovation. The traditional facets of this manually wound timepiece are its classic architecture with column-wheel control and the horizontal gear clutch. Numerous optimizations and patented innovations manifest the 21st century as does the fundamentally redesigned split-seconds mechanism.

The elegance of the polished case with a concave bezel and satin-finished recesses in the flanks gains prominence with a shiny night blue alligator strap and the platinum fold-over clasp.

As is the case with all of Patek Philippe’s platinum wristwatches, the new Ref. 5370P-011 is graced with a small diamond between the lugs at 6 o’clock. It replaces the predecessor version with the black enamel dial.

Further reading

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