Innovation
WHL presents an in-depth look at the Breguet Classique 7727 Chronométrie, a watch that pushes the boundaries of horological innovation. This article, featuring stunning photography, explores the technical advancements Breguet has incorporated to enhance timekeeping accuracy and stability. WHL's detailed analysis provides valuable context for understanding the significance of this groundbreaking timepiece.
I want to thank Stewart (docsnov) for the opportunity to take some photographs of his new Breguet Chronometrie, ref 7727. It is an outstanding watch and he has my congratulations on having added it to his fine collection.
The 7727 was first shown at Baselworld in 2012, and then again with some minor aesthetic changes at Baselworld in 2013. Moving from prototype to production has no doubt been a challenge, and production pieces have been coming out of Breguet’s Le Sentier facility at a slow trickle. I saw a white gold example at the New York boutique in May and this rose gold piece was the first I saw at an AD. I hope more of you will get the chance to experience it in person in the near future at a Breguet dealer near you. In the meantime, please enjoy the photos and some of my thoughts on this timepiece.
Historically speaking there have been many challenging factors, both internal and external to the movement, that watchmakers have had to deal with in creating regulating organs for their movements: pivots, lubrication, shock, temperature, and magnetism to name a few. All can effect timekeeping in undesirable ways.
With the Classique 7727 Chronometrie Breguet has employed some innovative thinking and advanced materials to limit these potential negatives. Watch houses have been incorporating silicon components in their watches for over a decade now, and the advantages of the material, especially with escapement parts, have been real. Silicon components require less, if any, lubrication, and with regard to external factors, are resistant to temperature changes and magnetic fields. Their use also has allows for Breguet to step up the beat rate to 10 Hz, or 72,000 VPH (twenty beats per second), which allows for a more accurate timekeeping and quicker recovery from shocks. Traditional materials cannot step up to such a high beat rate.
The surprising innovation of the Chronometrie is the use of magnetic pivots to hold the balance staff in position. The theoretical benefits of this is that the balance will keep the same amplitude no matter what position it is in, making for a more accurate timepiece. Breguet claims much tighter timekeeping tolerances for the Chronometrie compared with standard production watches: -1 sec/day to +3 sec/day is the tolerated range, and amplitude should be a consistent 300 degrees in all positions.
The timing machine that I have access to could neither read the high beat rate of the Chronometrie not determine the amplitude, so I cannot verify Breguet’s claims. I will leave it to docsnov to report on the general level of accuracy of his 7727.
The case of the 7727 is 41 mm in diameter, and the only options are rose gold and white gold. The signature fluted case band and soldered lugs are present here as on all Breguet models:
The silvered18K gold dial has a number of engine turned finishes on it. I especially appreciated the 40 wedges of the 2 seconds hand, which match the 40 beats that the watch makes in those two seconds it takes to make one rotation:
Watching that small hand fly around is one of the amusing and charming aspects of the watch. I don’t think I would ever tire of it.
The watch has a 60 hour power reserve
The cock to hold the pivot on the main plate side is incorporated into the dial, helping to keep the thickness of the watch nicely proportional to the diameter, and also bring a technological look to timepiece.
Regardless of the technology employed, the look of this watch is unmistakably Breguet. I admire how the brand honors both the aesthetic tradition and innovative spirit that A-L Breguet defined for his watches over two hundred years ago. Bravo!
Bill
The Rolex Cellini Time reference 7727 is part of the Cellini collection, which represents Rolex's more traditional and dress-oriented timepieces, distinct from its Oyster Perpetual professional and classic lines. This reference focuses on essential timekeeping, presenting hours, minutes, and seconds in a refined and understated manner, aligning with the Cellini's design philosophy of classic horology. It is designed to offer a sophisticated alternative within the brand's offerings, emphasizing elegance over robust utility.
This particular reference features an 18k Everose gold case, measuring 39 mm in diameter. It houses the automatic caliber 3132, a self-winding mechanical movement manufactured by Rolex. The watch is fitted with a domed sapphire crystal, contributing to its classic profile, and offers a water resistance of 50 meters. The movement provides a power reserve of approximately 48 hours, ensuring reliable timekeeping.
The Cellini Time 7727 appeals to collectors seeking a dress watch from Rolex that prioritizes classic aesthetics and horological tradition. Its Everose gold case and clean dial design make it suitable for formal occasions. The Cellini collection, including this reference, offers a different facet of Rolex's manufacturing capabilities, focusing on refined design and traditional watchmaking principles.
The magnetic pivot points is very unusual and unique. The detail of this watch is so detailed; from the 40 steps on the dial for the 2 second hand that makes 40 vibrations in those two seconds. Thank you for bringing this watch and its technical details to our attention Bill!
This movemet is very nice looking. Still have ot be convinced by the 10 Hz technology, though. As fir the dia, you are right, it is so Breguet! Best, Nicolas
And just as awesome aesthetics! Thanks a lot for sharing. Warm regards, Asad
than my pictures of my watch :-) Thanks for showing the 7727 in a better light than I did, and thanks for the information on the movement. As you know this is why I wanted the watch. As Nico said the technology has yet to be proven, but after reading about the movement and seeing how great the watch looked I was willing to take a chance on the magnets and the high frequency (double silicon hairsprings as well, very cool :-)) It has been running non-stop since its arrival and it seems to be keepi
the 7727 is on my shortlist and those pictures of the RG version are spectacular! Best A
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