Patek Philippe is extending the broad palette of its chronographs and grand complications with the addition of a new timepiece literally made for the right-hand wrists of left-handed collectors. With this goal in mind, the manufacture reinterpreted one of its most refined timepieces the ref. 5372 Split-Seconds Monopusher Chronograph. The new Patek Philippe ref. 5373P-001 Split-Seconds Monopusher Chronograph Perpetual Calendar features a platinum case and modern looks that emphasize its sporty and contemporary style dial. This new model will be produced in small series, appealing especially to left-handed collectors.

In 2005, Patek Philippe leveraged its know-how in the field of short-time measurement by launching a new initiative: the manufacture developed a complete series of chronograph movements with and without additional functions. All of them were designed and produced in-house. The starting signal was given by the manually wound caliber CHR 27-525 PS, the world’s thinnest column-wheel-controlled split-seconds chronograph movement. The caliber CHR 27-525 PS Q launched in 2010 —with the same base movement plus an extremely thin calendar module— has a height of only 7.3 mm. It is the thinnest split-seconds chronograph movement with perpetual calendar ever produced by the manufacture. Since 2017, this exceptional caliber has been crafted in very small numbers in line with venerable watchmaking traditions. It ticks in a platinum watch with a blue sunburst dial —Ref. 5372P-001— or a rose gilt dial with a vertical satin finish —Ref. 5372P-010.

Inspired by a one-of-a-kind piece sold by Patek Philippe in 1927, a custom-made cushion-shaped split-seconds chronograph movement No. 198012, the manufacture has now converted the ref. 5372 into a new version for left-handed collectors. The exclusive ref. 5373P-001 combines a split-seconds chronograph with the perpetual calendar which stands emblematically for the grand complications of Patek Philippe.

With a diameter of 38.3 mm, the platinum case has the same size as the ref. 5372 but its crown —with an integrated chronograph monopusher— is at 9 o'clock and the split-seconds pusher occupies an unusual position at 8 o'clock. It preserves its timeless elegance with the polished, concave bezel that creates the perfect transition to the slightly domed sapphire crystal back, the recessed and satin-finished case flanks, and the delicately curved strap lugs that merge with the bars almost seamlessly.

The indications of the dial are rotated by 180 degrees, the analog date at 12 o'clock, the subsidiary seconds at 3 o'clock, the moon phases at 6 o'clock and the 60-minute counter at 9 o'clock, complemented by the aperture displays for the day of the week and the month as well as the leap year cycle at 10:30 and the day/night indicator at 1:30. Patek Philippe has also reworked the aesthetic appeal of this 18K gold dial, endowing it with a charcoal-colored aspect and a vertical satin-finish; it is ingeniously animated by a black gradation to the periphery and the snailed ebony-black subsidiary dials. The indication of the time is based on applied Arabic numerals and faceted Dauphine hour and minute hands in white gold. The moon-phase display is extremely precise: it deviates from the actual lunar cycle by just one day every 122 years. For crisp legibility, the three chronograph hands from the center —chronograph and split-seconds hands as well as the 60-minute counter hand at 9 o'clock— are varnished red. The three chronograph commands —Start, Stop, and Reset— are selected with the monopusher in the crown at 9 o'clock. Stopping lap times with the split-seconds —rattrapante— hand is handled with the rectangular pusher at 8 o'clock.

A sapphire crystal display back —interchangeable with the solid-platinum back delivered with the watch— reveals the fantastic architecture of the manual wound calibre CHR 27-525 PS Q movement with its two column wheels that bear two polished caps in the typical Patek Philippe style. The bridges, decorated with Geneva striping, are carefully chamfered and the edges are polished. A focus is also on the elegance of the form parts and the bridges à l’ancienne. Their acute internal angles can only be completed by hand, which calls for considerable dexterity and many years of experience. The movement provides a power reserve of 48 hours.

The sporty looks and modern attitude of the dial also applies to the black calfskin strap with an embossed textile texture and red contrast seams. It is secured with a platinum fold-over clasp. Like all of Patek Philippe’s platinum watches, the new Ref. 5373P-001 features a brilliant cut diamond in the caseband. As an exception for left-handed collectors, it is set at 12 o'clock in this timepiece.

From now on, this watch is the only remaining model with the caliber CHR 27-525 PS Q movement that was formerly available in the Ref. 5372P-001 and 5372P-010; both models have been retired from the collection.

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