Blancpain Caliber 13p8

Blancpain Caliber 13P8

Blancpain Caliber 13p8 Fifty Fathoms 70th Anniversary Diver

Manufacturer Blancpain
Caliber Number 13P8
Base Caliber
Blancpain 1315
Type Automatic, self-winding mechanical
5.65mm thick
Jewels 35
Number of Parts 204 components
Vibrations Per Hour 28,800 bph (4Hz)
Power Reserve 120 hours (5 days)
Barrel Count
18K gold, signed “Gombessa Expeditions”
Anti-Shock Device
Glucydur, free-sprung
Gold screw inertial regulation, no fine-tuning device
Hands Count
Functions Central hours; central minutes; central sweeping seconds; central 3 hour dive-time hand
Hacking Seconds?
Country of Manufacture Switzerland, Swiss made
Known Models
Blancpain Fifty Fathoms Gombessa Tech 70th Anniversary Act 2 (ref: 5019 12B30 64A)

The Blancpain caliber 13P8 is a 4-hander, no-date, automatic movement found in the brand’s Fifty Fathoms Gombessa Tech 70th Anniversary Act 2 model (47mm diameter, titanium, $28,000 USD) that was released on February 16, 2023.

This in-house caliber is adjusted in 6 positions from the factory. It has 35 jewels with a total of 204 parts. The 13P8 also has an extra long power reserve of 120 hours, thanks to its 3-barrel design.

3 Hour Dive-Timer:

The cal. 13P8 is equipped with a 3 hour dive-time complication, which has a fourth hand (similar to a GMT) that rotates every 3 hours. Combined with a unique layout on the bezel, this feature makes it easy to time a dive.

Below you can see the markers on the bezel that work in unison with the Dive-Time hand: 30 (minutes), 1 (hour), 1:30 (1.5 hours), 2 (hours), 2:30 (2.5 hours).

Blancpain Caliber 13p8 Fifty Fathoms Gombessa Tech Bezel

Gombessa Expeditions:

You may notice that the 18K gold rotor is signed Gombessa Expeditions. Here is more about what that means:

“Laurent Ballesta’s Gombessa project focuses on studying some of the rarest, most elusive marine creatures and phenomena on Earth. Ballesta and his team use state-of-the-art closed-circuit rebreather diving techniques to reach extreme depths and bring back unique scientific data, photographs, and videos. Their activities are consistently marked by triple challenges of a technical, scientific and artistic nature. To date, there have been five Gombessa expeditions, all underwritten by Blancpain.” –source

Front and Back:

Despite what it looks like in the first image above, the 13P8 is an automotive movement. The image simply shows the movement with the automatic wind unit removed. This is to show the complete finishing of the movement without being obstructed by the rotor.

How to Reset the Dive-Time Hand?

You can’t. That’s one of the cons of this movement. Rather than setting the hand independently, you’re supposed to rotate the bezel to line up the diamond shaped marker with the hand in its current position. From there, you can begin to calculate your 3 hour dive time. If you thought that’s what the crown at 10:00 is for, you’re mistaken. The crown at 10:00 is for the helium release valve.


Additional Images:

Blancpain Caliber 13p8 Fifty Fathoms 70th

Watches with this movement:

Additional Resources:

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1 year ago

The movement isn’t even that big so why is the watch so huge? Who is diving with a 47 mm watch on their wrist? I’d be all over it at 40-42 mm. 47 is stupid.

1 year ago
Reply to  Blonkpon

Using a divewatch as a dive instrument, size is a feature and 47 mm is anything but stupid. E.g. Oris Aquis Depth gauge (45.8 mm) is pretty good, and one has to remember that the watch is most likely worn on top of a neoprene suit or a rubber cuff. The Gombessa ticks of a lot of boxes for the perfect backup and is probably the best mechanical diver watch money can buy for it’s purpose. I consider it THE reference to measure anything else by. I have dived with sub 40mm, and they suffer in legability and use of… Read more »

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