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Watches From Panerai to Hublot: Luxury Watchmakers That Have Timepieces With Exceptional Power Reserves

From Panerai to Hublot: Luxury Watchmakers That Have Timepieces With Exceptional Power Reserves

From Panerai to Hublot: Luxury Watchmakers That Have Timepieces With Exceptional Power Reserves
Hublot’s MP-05 LaFerrari Sapphire (Photo: Courtesy of Hublot)
By Christian Barker
May 18, 2020
Providing extended periods of fuss-free operation, mechanical watches with formidable power reserves both save time and tell it

Do those magical, mystical crystals the so-called ‘new age’ folk swear by actually work? Who knows. The quartz crystals used in low-cost watchmaking, however, have well and truly proven their efficacy. In a quartz watch movement, a battery sends an electrical signal through a piece of crystal, driving the watch’s hands and functions. They’ll keep perfect time for three or four years, the life of the battery.

A watch’s energy, meanwhile, is stored in a coiled mainspring, and is released as this gradually unwinds, powering the watch’s timekeeping functions and other complications. The number of hours of energy the mainspring provides before it needs winding—or, in the case of an automatic watch, a decent wearing or a thorough shake—is known as power reserve.

We won’t go into greater detail about the science of mainsprings, because the minutiae of watch engineering are rather unsexy, technical stuff. If you’re curious to learn more, google ‘How does a mainspring work?’ and you’ll soon discover reams of reading as dry as a good martini and equally as stupefying. The important thing to know is, mechanical watches generally need powering up every couple of days—most quality mechanical watches have a power reserve of at least 42 hours. Some, however, far exceed that figure.

(Related: 4 Reasons Why You Should Call Your Watch Retailer This Month)

Panerai’s P5000
Calibre (Image: Panerai)
Panerai’s P5000 Calibre (Image: Panerai)

Size Matters

Panerai is known for its oversized watches, many of which boast large power reserves. The brand isn’t bashful about it, often boasting of the length of their mainsprings on watches’ dials or in their names—for instance, a few of our favourites from their current range include the Submersible 1950 3 Days Automatic Bronzo, Luminor Marina 8 Days Acciaio and the formidable Radiomir 10 Days GMT Platinum. Panerai also produces pocket watches in white and pink gold with three-day reserves, should you be looking to put more power in your palm.

Hublot’s MP-05 LaFerrari Sapphire (Image: Hublot)
Hublot’s MP-05 LaFerrari Sapphire (Image: Hublot)

Large cases can be helpful when building a lengthy power reserve into a watch. IWC’s 46mm-cased Big Pilot’s watches, for example, boast 168 hours (seven days) of power reserve. The Schaffhausen-based company also produces an array of watches with eight-day power reserves, equipped with hand-wound movements from the Calibre 59000 family, including iterations of iconic IWC models the Portofino, Portugieser, and the Big Pilot’s watch.

Measuring a hefty 64mm across, the first timepiece issued by the mech-art mad scientists at MB&F, 2007’s Horological Machine No 1, packed in seven days’ power. The ‘Melchior’ robot-shaped desk clock Max Büsser dreamt up in partnership with clockmakers L’Epée used five mainspring barrels to offer 40 days without a wind-up.

Panerai’s Submersible Bronzo PAM968 (Image: Panerai)
Panerai’s Submersible Bronzo PAM968 (Image: Panerai)

High Tech

Grand Seiko’s master watchmakers at its Micro Artist Studio in Shio-jiri, in the mountains of central Japan, devised an eight-day power reserve hybrid Spring Drive movement (dubbed Calibre 9R01) that, while battery-free and powered by a conventional mechanical mainspring, integrates elements of electronic watchmaking.

In the Grand Seiko Spring Drive 8 Day Power Reserve, accuracy is controlled by a microelectronic quartz mechanism (charged by a rotor powered by gears connected to the mainspring), while the hands are driven by the traditional unwinding of the mainspring. Producing them in elegant platinum or rose-gold cases, the company’s goal was to create a refined mechanical watch with accuracy and convenience comparable to that of quartz. 

(Related: 7 Reasons Why The Grand Seiko Is The Ultimate Cult Watch)

Hublot’s MP-
05 LaFerrari Sapphire (Image: Hublot)
Hublot’s MP- 05 LaFerrari Sapphire (Image: Hublot)

Hublot’s mission in creating the MP-05 LaFerrari was to echo the high-octane V12 engine of the supercar that inspired it. “The idea was to put the engine in the watch. So, like if you had a 12-cylinder engine in a watch,” CEO Ricardo Guadalupe told reporters. “Of course there’s no horsepower in a watch, so we said instead we could create a long power reserve.” The longest ever, in fact. In the audacious, cobra-shaped LaFerrari, “we have 50 days of power reserve, which is also a historical world record for a mechanical watch”.

This epic 1,200 hours of stored energy is delivered by 11 centrally mounted and coupled mainspring barrels. A power drill-like tool is provided to speed up the task of winding this beast—a job the owner, fortunately, need only undertake five or six times a year. So make like a mainspring: relax and unwind.

(Related: Hublot Collaborates With Yohji Yamamoto To Release An All-Black Big Bang Watch)


The May 2020 issue is now available with our compliments on Magzter.

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Watches Watch Column Watchmaking Panerai Hublot Jacquet Droz Watch Brands IWC Schaffhausen Grand Seiko Craftsmanship luxury watches luxury watch brands timpieces power reserve

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