Leading up to Patek Philippe’s 175th anniversary, speculation and anticipation were running wild in watch enthusiast circles around the globe. And the recurring theme rising to the forefront of the collective Patek devotee’s imagination was that of a grande sonnerie. A grande sonnerie is a watch that features a minute repeater but is also able to strike the time in passing. In grande sonnerie mode, it strikes the hours and the quarters at each quarter; and in petite sonnerie mode, it strikes just the quarters. In both modes, it strikes the hours upon the hours.

This type of watch has been notably absent from Patek Philippe’s repertoire of horological achievements — an absence that is particularly conspicuous since the brand is often considered to make the world’s best-sounding striking watches. Behold, just launched for Patek’s anniversary, the reference 5171 — a grande sonnerie watch that surpassed even our loftiest expectations, in terms of the sheer imaginativeness, functionalism and beauty of its execution, and is moreover in a single watch a combination of all major striking complications as well as an unprecedented date striking complication –all in a reversible case allowing either the ‘time side’ or ‘calendar side’ displays to be shown at will.

patek philippe 5052

Before you get all excited, hang on, because Patek is producing only six of these with a seventh for their museum — each pegged with the price tag of CHF 2.5 million. And in all likelihood, they will only go to the most significant Patek collectors on the planet.

patek philippe ref 39701w

So what’s so amazing about this grande sonnerie? First of all it features three gongs and three hammers and strikes the quarters on a beautiful combination of three notes, creating a thrilling sonic aria that alternates with each quarter. Grande, petite or silent mode is selected with a switch integrated into the left side of the case. The two other pushers on the left side operate the watch’s second time zone, while the aperture next to the central pinion turns from blue to white to delineate day or night hours in the second time zone.

patek philippe 5054

One of the greatest innovations relates to its striking alarm function. The main subdial at 12 o’clock displays the alarm hours in 24-hour format, segmented in between each hour into quarters. By pushing the crown at 2 o’clock, you arm the alarm. This will cause the small bell shaped aperture inside the subdial to turn red. The alarm will actually sound two minutes before the prescribed time. So if it’s 1 o’clock that you’ve set the watch to, the alarm will strike 12 times for the hours, three sets of 3 notes for the quarters and then 13 more times for the minutes to signal it’s 12:58 — all in all, a combination of 33 strikes. Says Philip Barat, Patek Philippe’s product guru, “We decided that if it just struck one time at 1 o’clock, this would probably not wake you up. The least amount of strikes that the alarm can strike is when the watch signals it’s 1: 15, in which case it will strike one time for the hours and 13 times for the minutes —which should still wake you up!”

patek philippe 5002

patek philippe 5120

Caliber GS AL 36-750 QIS FUS IRM

When in alarm mode, the alarm takes precedence over all over striking functions, which are blocked. To release it, you pull the crown. The crown has three positions: the first is for winding (one direction for the two barrels for the movement, and the other direction for the two sonnerie barrels with 30 hours of power reserve in grand sonnerie mode). The second position is for the alarm setting and the third position is for the time. Barat also points out that all strike functions are isolated so that if the grande sonnerie mode is ringing and you push the minute repeater — normally a recipe for disaster in a lesser watch — here, immediately after the sonnerie strike is over, the repeater strike will happen. A small aperture on the top right of the watch turns red when your sonnerie power supply is on the wane, though with 30 hours of reserve even in grande sonnerie mode the watch has a greater power reserve than two iPhones put together.

patek philippe 5036

But perhaps the most notable feature of the watch is the date-striking complication –yes, the Grandmaster Chime strikes the date as well, with the repeater train taking date info from the perpetual calendar train.  The technical aspects of this function are the subject of a patent granted to Patek Philippe. Activate the pusher at 4 o’clock and the date is sounded in a combination of low-high coupled strikes (as opposed to the high-low strike that usually marks the quarters in minute repeaters) for the digit in the tens position, followed by consecutive single strikes indicating the digit in the units position of the date.  In order to link the date to the perpetual calendar, the movement –Patek Philippe calibre GS AL 36-750 QIS FUS IRM –is fitted with a snail-and-rack system for transmitting the information from the calendar system to the repeating mechanism, in addition to the snail-and-rack system from which the repeater mechanism “reads” the time.

patek philippe b1075g 3

If all this isn’t enough, the watch is double faced and features a case that can actually swivel in its lugs and show off its stunning perpetual calendar second dial (with quickset back and forth adjust function for the year that is linked with the leap year indication) selected by Philippe Stern and based on a museum watch dating to 1915. As the alarm function was completely the desire of Thierry Stern, this one watch is also the living repository of the two great Stern men involved in this magnificent creation designed to showcase 175 years of accumulated mastery in the very highest levels of the art of watchmaking.

patek 5055

The Patek Phillipe Grandmaster Chime 175th Anniversary Perpetual Date Repeater, Grand et Petite Sonnerie with Minute Repeater and Alarm, presented by Philippe and Thierry Stern

Movement: Caliber GS AL 36-750 QIS FUS IRM.

Manually wound mechanical movement, 20 complications, chiming mechanism with 3 gongs and 5 different time strikes (Grande and Petite Sonnerie, minute repeater, alarm with time strike, date repeater); second time zone with day/night indicator; instantaneous perpetual calendar (date on both sides, day of week, month, leap-year cycle, four-digit year display, 24-hour and minute subdial, moon phases, strikework mode display, strikework isolator display, alarm ON/OFF, crown position indicator, and power reserve indicators for the movement and the strikework

Functions: 3-position crown
• Pushed home: To wind the movement clockwise; to wind the strikework counterclockwise
• Pulled halfway out: To set the alarm time
• Pulled all the way out: To set the time

• Strikework mode selector at 9 o’clock

Case: Round, with patented reversing mechanism on the axis from 12 to 6 o’clock, 18K rose gold, 214 parts, sapphire crystals on both sides, protected against dust and moisture, not water-resistant Laurel wreath motif on bezel, caseband and lugs relief-engraved by hand, hand-engraved function inscriptions and symbols on caseband and pushers

Time side dial:  18K gold, silvery white opaline, center with radially undulated guilloché pattern, applied 18K gold Roman numerals,local time hour and minute hands in black nickel-plated 18K white gold, hour hand for second time zone in 18K rose gold Hands for alarm time, movement and strikework power-reserve indicators, strikework mode and crown position in 18K rose gold

Calendar side dial: 18K gold, silvery white opaline, center with polished gold frame for the four-digit year display. Subsidiary dials for the 24-hour display, day, month, date, and leap-year cycle with black printed scales and black nickel-plated steel hands

Patek Philippe Grandmaster Chime Ref. 5175 Patents and innovations

Patent: Alarm mechanism with time strike
Mechanism that acoustically indicates a preset alarm time with hour, quarter-hour, and minute strikes using the chiming mechanism of the minute repeater.

Patent: Isolation of the Grande Sonnerie in the Silence mode
Mechanism that totally uncouples the Grande Sonnerie from the movement when the Silence mode is selected, eliminating friction and thus power consumption.

dPatent: Selection of strikework operating mode
Mechanism that allows the automatic time strike to be selected or disabled with a single slide switch: Grande Sonnerie, Petite Sonnerie or Silence. Formerly, two separate switches were needed to make these settings.

Patent: Date repeater
Mechanism that obtains date information from the perpetual calendar and forwards it to the repeating mechanism. Manufacture president Thierry Stern is the inventor.

Patent: Reversible wristwatch case
Wristwatch case with rotating and latching devices in the lugs, allowing it to be turned along the axis from 12 to 6 o’clock and locked in either of 2 positions.

Patent: Mechanism for a four-digit year display
Mechanism that automatically synchronizes the four-digit year display with the leap-year cycle and allows convenient correction of both displays in either direction.

Innovation: The strikework differential
An innovative masterpiece of micromechanical engineering (not patented): the differential between the strikework double barrels and the two strikework mechanisms for the Grande Sonnerie (incl. minute repeater and alarm) and the date repeater.
It has a diameter of 7.2 mm and consists of 19 separate parts, one of which is an 11-part ball bearing with 7 balls with a diameter of 0.3 mm each. Despite its small size, it is robust enough to transmit the torque of the strikework barrels which exceeds 1700 gmm.

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