Patek Philippe Ref. 5531R World Time Minute Repeater

Presented at Baselworld 2018, this new grand complication watch from Patek Philippe merges two iconic horological mechanisms – Minute repeaters and World Time.

Minute repeaters and chiming watches from the prestigious Geneva watch manufacture are renowned for their exceptional acoustic quality, the broad range of models and variations, and the interesting combinations with other complications. Patek Philippe’s World Time watches with cloisonné enameled dials are legendary as well; they rank among the most coveted timepieces at auctions worldwide.

In the Ref. 5531 World Time Minute Repeater, the engineers in Geneva merged these two complications for the first time in Patek Philippe’s history, and also in an unprecedented way: the time is always struck as indicated by the hour and minute hands for the time zone represented by the city aligned with the 12 o’clock position.

All other minute repeaters with 24 time zones systematically strike home time even if they and their owners are far away from home. Conversely, Patek Philippe’s Ref. 5531 World Time Minute Repeater, chimes the time, accurately to the second, at its current location.

In the 1930s, Genevan master watchmaker Louis Cottier invented a remarkable system capable of displaying the time in all 24 time zones as referenced by the cities printed on the dial or engraved in the bezel. In 1999, Patek Philippe fundamentally improved the functionality of its World Time watches by adding a patented mechanism. When moving from one time zone to another, this solutions allows all three time zone indications to be corrected with a single pusher. A single actuation adjusts the city disk, the 24-hour disk, and the center hour hand by one-hour steps without affecting the rate accuracy of the movement. Now, the challenge was to join this mechanism with a minute repeater in a way that would best address the purpose of such a watch. The result is Patek Philippe’s new self-winding caliber R 27 HU movement with the World Time function and a minute repeater.

The owners of a World Time Minute Repeater want more than to see the time in all of the world’s 24 time zones at a glance. They also want a highly legible reading of the time at their current location, on demand also acoustically with the incomparable sound of a Patek Philippe minute repeater. This goal has now been achieved by the manufacture for the first time in horological history.

Until now, minute repeaters with the World Time function were only able to chime home time as previously defined with the crown because the two complications operated independently from one another. An acoustic local time indication requires the World Time display with the rotatable city and 24- hour rings to be mechanically coupled with the chiming mechanism.

The heart of a conventional minute repeater consists of three cams, referred to as snails: the hour snail with twelve steps, the quarter snail with four steps, and the minute snail that has four wings with 14 steps each. At any given point in time, these snails are in clearly defined positions. The minute snail is firmly connected with the quarter snail; it has a pin which advances the 12-hour star with the hour snail by one increment after each full revolution. As soon as the minute repeater has been activated with the slide in the case flank, the steps of the different snails are consecutively sampled. Each passage from one step to another triggers a strike on a given gong. If the chiming mechanism is activated at 5:37, the hour beak slides across five steps, causing the lower-pitched gong to be struck five times. Then, the quarter feeler glides across two steps and triggers two high-low double strikes on both gongs to indicate two quarter hours. Finally, the minute feeler samples 7 steps of the third wing of the minute snail, triggering 7 strikes of the high-pitched gong: 7 minutes. The time is 5:37. All this takes place in tiny dimensions with millimeter-size parts of complex shapes that are less than a tenth of one millimeter thick and microscopically small pins as well as filigreed steel springs which are difficult to recognize as such by the naked eye.

In the caliber R 27 HU of the Ref. 5531 World Time Minute Repeater, this mechanism features fundamental changes with new designs and new components for which patent applications have been filed. While the minute and quarter snails remain interconnected on the cannon pinion, the hour snail is now continuously driven by the time-zone wheel of the World Time mechanism rather than being controlled by the quarter snail. Here, the patented solution with the continuously rotating World Time function makes it possible to advance the 12-hour star with the hour snail to one-second accuracy. In Patek Philippe minute repeaters, the time window from one hour strike to the next is merely one second.

An example: Until 5:59:49, the acoustic time indication for 5:59 is 5 hour strikes, 3 double strikes for three quarter hours, and 14 minute strikes for a total of 25 strikes. Only one second later – at 5:59:50 – the watch strikes 6 o’clock (6 hour strikes). Once the 10 seconds have elapsed, the hands show exactly 6 o’clock when the last minute strike is completed. In a conventional minute repeater, this is easier to control because the hour snail is advanced by the quarter snail in jumping increments. Given the continuously rotating hour snail in the World Time Minute Repeater, this is a much more complex process, but the patented Patek Philippe solution handles it very precisely and with great elegance. Once again, the manufacture delivers proof that it masters the technology of chiming watches and the integration of additional complications.

As soon as the minute repeater is actuated with the slide in the left-hand case flank, the mechanisms that execute the hour, quarter, and minute strikes briefly interact to sound the melody of time with the acoustic quality and rhythmic harmony that is characteristic of Patek Philippe strikework masterpieces. Concurrently, the World Time mechanism is blocked so that for the duration of the time strike – while the delicate snails, racks, wheels, and levers are engaged – no time zone adjustments can take place. And as is the case with all Patek Philippe World Time watches, an adjustment of local time with the pusher at 2 o’clock does not have a negative influence on the rate of the movement.

A further patented modification distinguishes the Ref. 5531 World Time Minute Repeater from other Patek Philippe watches: its two gongs (one high-pitched, the other low-pitched) are attached to the caseband instead of to the plate of the movement.

The self-winding caliber R 27 HU is comprised of 462 individual parts, which are crafted to the highest degree of precision, carefully finished in compliance with the directives of the Patek Philippe Seal and assembled with a steady hand. This movement also fulfills the rate accuracy benchmark of -3 to +2 seconds per day as stipulated by the Patek Philippe Seal. Its 22K gold mini-rotor is fully recessed in the bridge plane. It borrowed its architecture from the basic R 27 caliber that was originally launched in 1989 on the occasion of the manufacture’s 150th anniversary. With the legendary movement, Patek Philippe succeeded in reviving the wristwatch with a minute repeater. Thanks to its design, although highly elaborate, the caliber R 27 HU movement is remarkably thin: only 8.5 mm at its thickest point.

Despite its height of 11 mm, the silhouette of the 18K rose-gold case is exceptionally svelte and elegant. This is due to the generously skeletonized lugs, the sharply slanted bezel, and the shape of the glass. All three features make the watch appear less voluminous. The hand-guilloched hobnail pattern, typical for Patek Philippe, choreographs the reflections of the light and underscores the elegance of the timepiece. The same motif adorns the slide in the left-hand case flank for actuating the minute repeater, assuring consistency of style. In contrast, the pathway of the slide is horizontally satin-finished.

The time-zone pusher at 2 o’clock is polished. The sapphire-crystal display back reveals the chamfered bridges with Geneva striping, the guilloched minirotor in 22K gold, and the gold-plated Calatrava cross cover on the centrifugal governor of the chiming mechanism. The watch is also available with an interchangeable solid 18K rose-gold case back.

Made of 18K gold and German silver, the watch dial boasts the city disk, the 24-hour disk, and the artistically adorned center. The aesthetic beauty of this complex dial is paired with superb legibility. The city disk is lacquered silvery white opaline; the place names are printed in black. It is to be noted that Central European Time is not represented by Paris as usual but rather by Geneva to emphasize the Lac Léman theme of the dial, as was already the case with the World Time watches introduced to salute the 175th anniversary of the manufacture in 2014. On its day half (7 am to 6 pm) with the engraved sun symbol, the numerals of the rose-gold 24-hour disk are engraved and tinted brown. The night half (7 pm to 6 am) is brown, highlighting the rose gold glow of the engraved numerals and moon symbol. A small work of art occupies the center of the dial, saluting the heritage of Patek Philippe World Time watches: an artistic cloisonné enamel depiction of the Lavaux winegrowing region – a UNESCO World Heritage site – with a lateen-rigged boat that has set sail.

The Ref. 5531 is the first and only Patek Philippe minute repeater decorated with cloisonné enamel. The 18K rose-gold hour and minute hands hover above the Lavaux landscape. Both are lapped and feature a sharp center ridge. The shape of the hour hand is reserved for World Time watches. Carefully pierced, it traces the silhouette of the “Southern Cross” constellation.

The watch is worn on a hand-stitched shiny chocolate brown alligator strap with large square scales, secured with an 18K rose-gold fold-over clasp.

Technical details
Model: Ref. 5531 World Time Minute Repeater

Movement
Caliber R 27 HU
Ultra-thin self-winding mechanical movement
Minute repeater with local-time strike. 24 time zones. Local time
Diameter: 32 mm (basic caliber: 30 mm; World Time module: 32 mm)
Height: 8.5 mm (basic caliber: 5.2 mm; World Time module: 3.3 mm)
Number of parts: 462
Number of jewels: 45
Power reserve: 48 hours
Winding rotor: 22K gold minirotor, uni-directionally winding
Frequency: 21,600 semi-oscillations per hour (3 Hz)
Balance: Gyromax®
Balance spring: Spiromax® (in Silinvar®)
Balance spring stud: Adjustable

Displays
With hands: Center hours and minutes
With disks: City disk with 24 place names and 24-hour disk

Functions
Two-position crown:
• Pushed home: To wind the watch
• Pulled out: To set the time
Pushers: Time-zone pusher at 2 o’clock (local time setting in 1-hour increments)
Minute repeater actuation: Slide in left-hand case flank

Hallmark
Patek Philippe Seal

Case
18K rose gold 5N
Sapphire-crystal display back and interchangeable solid-gold back
Case protected against moisture and dust, not water-resistant
Diameter 10 to 4 o’clock: 40,2 mm
Width 9 to 3 o’clock: 43.83 mm
Length across lugs: 47.35 mm
Height (crystal to lugs): 12.08 mm
Height (crystal to case back): 11.49 mm
Width between lugs: 21 mm

Dial
City disk in German silver, lacquered opaline silvery white with place names printed in black
24-hour disk in 18K rose gold 5N, day hours engraved and brown tinted – engraved sun symbol, night hours and moon symbol engraved in brown background
Center 18K gold, cloisonné enamel with polychrome depiction of Lavaux landscape on Lake Geneva
Hour and minute hands in 18K rose gold, lapped, hour hand with “Southern Cross” silhouette, pierced

Strap
Alligator leather with large square scales, hand-stitched, shiny chocolate brown, fold-over clasp in 18K rose gold

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