A Legendary Military Dive Watch Debuts a New Super Power

You only have to wind this hand cranker once a month.

Rose gold watch with black skeleton dial, date display, and black rubber strap embossed with "CINE" on a red background.Panerai

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When Panerai began making watches for the Royal Italian Navy in the 1930s, providing an increased power reserve to preserve the integrity of the crown was a primary concern. It led to the 8 Giorni, meaning “eight days” in Italian, a mechanical movement that provided just over a week of power.

Nearly a century later, the Italian watchmaker is still pushing the limits of mechanical power reserve and has just raised the bar with a mind-blowing 31-day reserve.

Rose gold Panerai Luminor wristwatch with black skeleton dial, date display, and black leather strap.
The Lumninor 31 Giorni is named for its 31 day power reserve.
Panerai

Watches and Wonders Geneva: Rolex, Grand Seiko and dozens of other heavy hitters gather in Switzerland every year to release their biggest watches. Catch up on all the new novelties.

Fittingly named the Luminor 31 Giorni, this addition to the brand’s flagship dive watch collection only has to be wound 12 times per year. It comes in a fittingly impressive package, featuring a 44mm-wide Goldtec case with a rose gold hue and a satin-brushed finish.

The skeletonized dial reveals a top view of the mechanical marvel powering the characteristic central hour and minute hands, with a small seconds astride at 9:00.

Goldtec-framed hour markers with white lume inlays are fastened to the rehaut and float above the dial.

Rose gold Panerai Luminor wristwatch with black skeleton dial and black rubber strap on a textured surface.
The Luminor 31 Giorni dial features a scaled 31-day power reserve indicator and a novel polarized date window.
Image by Brad Lanphear for Gear Patrol

The dial also includes a scaled 31-day power reserve indicator with a white arrow pointer that matches the hour markers.

It also utilizes a novel polarized date disc, visible only in polarized light through the date aperture, with the remainder of the disc turning invisibly behind the skeletonized dial.

Quad barrel

The Luminor 31 giorni debuts the Panerai Caliber P.2031/S hand-wound movement. The full month of power is stored in four barrels, stacked two-by-two on the crown side of the movement.

Rose gold watch case back showing intricate black and silver mechanical movement with purple jewels and black rubber strap.
The four barrels of the Caliber P.2031/S are visible through the sapphire exhibition caseback.
Image by Brad Lanphear for Gear Patrol

The outer two barrels, along with a majority of the movement’s machinations, are visible through a full sapphire crystal exhibition caseback.

It’s difficult to make out, but the movement also includes a torque limiter, which concentrates the quad barrels’ potential 36 days of power into a steady and consistent 31 days.

Close-up of a luxury watch face showing a rose gold case, black dial with visible gears, date window, and "31 GIORNI" power reserve indicator.
The date window at 9:00 features a polarized pane that reveals the specially designed date disc, which is otherwise not visible.
Panerai

The one thing images can’t convey is how hefty this watch feels on the wrist. All of that power quite literally weighs heavily on your body, but not in an unwieldy way.

Panerai remains a tool watch brand first and foremost, and the weight is a reminder of the watch’s utilitarian strength. But the rubber strap with a Goldtec pin buckle eases the impact on the wrist.

Availability and pricing

The Panerai Luminor 31 Giorni is a limited-edition of 200 pieces, available exclusively through Panerai boutiques for $107,000.

Panerai explains that this novelty demonstrates what can be done with mechanical power reserve, and that the radical mechanics will be applied to more approachable releases down the road.

Rose gold Panerai Luminor wristwatch with black skeleton dial and black rubber strap.Panerai

Panerai Luminor 31 Giorni

Specs

Case Size 44mm
Movement Panerai Caliber P.2031/S automatic
Water Resistance 100m

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