Patek Philippe’s new Ref. 6301P Grande Sonnerie is the brand’s first wristwatch that “presents the grande sonnerie as the epitome of horological complications in its purest form,” complemented with a petite sonnerie and a minute repeater, a combination long awaited by watch collectors.
To do so, Patek Philippe has developed a new movement as a spin-off of the caliber 300 of the famous Grandmaster Chime. Consisting of 703 parts, the caliber GS 36-750 PS IRM is comparatively compact for the functions it offers (diameter: 37 mm; height: 7.5 mm).
The 6 complications of the new Ref. 6301P Grande Sonnerie:
- Grande sonnerie
- Petite sonnerie
- Minute repeater
- Movement power-reserve indicator
- Strikework power-reserve indicator
- Jumping seconds
Patek Philippe equipped the caliber GS 36-750 PS IRM with two tandem-connected twin mainspring barrels, one for the going train and the other for the chiming mechanism. This configuration delivers a power reserve of 72 hours for the movement and of 24 hours for the strikework. The two twin mainspring barrels are wound with the crown pushed in and rotated clockwise to wind the going train and counterclockwise to wind the strikework. The four mainsprings feature slip bridles to avoid overtensioning.
“Thanks to the energy stored in the twin mainspring barrel of the strikework, this adds up to an impressive total of 1056 strikes in 24 hours.”Patek Philippe
Patek opted for three classic gongs – low, medium, high, an option that traditionally requires more energy than systems with two gongs. The hours are struck on a low-pitched gong, the quarter hours with a three-strike high-lowmedium sequence. The melody for the first quarter hour (15 minutes) sounds once, for the second quarter hour (30 minutes) twice and for the third quarter hour (45 minutes) three times. Each quarter-hour sequence is automatically preceded by the number of elapsed hours, and followed by the number of quarter hours. Thanks to the energy stored in the twin mainspring barrel of the strikework, this adds up to an impressive total of 1056 strikes in 24 hours.
The owner can also select the strikework mode petite sonnerie; it strikes the full hours but omits the repetition of the hours when striking the quarter hours. In the silence mode, the automatic time strike is switched off altogether.
The selection of the strikework mode is performed with a slide switch in the caseband at 6 o’clock. This patented feature was already developed for the Patek Philippe Grandmaster Chime and allows the selection and activation of the strike mode with a single slide switch. On request, the minute repeater can be triggered by pressing the pusher in the crown at 3 o’clock.
One of the biggest challenges was the integration of a small jumping seconds display at 6 o’clock, something that was never done with a grande sonnerie. Based on the four patents of the 175th-anniversary model, the Ref. 5275 Chiming Jump Hour, the 6301P does not rely on jumper springs as usual but instead comes with wheels and a release lever that instantaneously unblocks the wheel train every second, making energy consumption easier to regulate and control, according to Patek.
The new Ref. 6301P is part of the brand’s regular collection (although its complexity limits production to a few pieces per year), price upon request.
|Caliber GS 36-750 PS IRM. Manually wound mechanical movement. Grande and petite sonnerie, minute repeater on 3 gongs. Jumping seconds. Strikework mode indicator (petite sonnerie, grande sonnerie, silence). Power-reserve indicators for movement and strikework.
|Center hour and minute hands, jumping subsidiary seconds at 6 o’clock, movement power reserve at 9 o’clock, strikework power reserve at 3 o’clock
|Platinum 950 with a flawless Top Wesselton diamond between the lugs at 12 o’clock. Not water-resistant, protected against moisture and dust. Sapphire-crystal case back and interchangeable solid back.
|Diameter: 44.8 mm, height: 12 mm
|18K gold, black grand feu enamel with “glacé” finish. Applied Breguet numerals in 18K white gold, leaf-shaped hour and minute hands in 18K white gold with luminous coating. Subsidiary seconds at 6 o’clock with “dague” type hand in white gold, printed railway track seconds scale with luminous 10-second markers Printed railway track minute scale with luminous 5-minute markers “Cheveu” type hands in white gold for the power-reserve indicators for the movement and the strikework.
|Hand-stitched alligator leather with large square scales, shiny black, platinum foldover clasp.