Piaget Altiplano 900P World’s Thinnest Mechanical Wristwatch

December 29, 2013

In 2014 Piaget will celebrate its 140th anniversary with a new record in ultra-thin mechanical watchmaking: the Altiplano 38 mm 900P. Simply said, this is a WOW watch – all 3.65mm of it! While clearly geared towards cutting-edge innovation, it is also a nod to history, since it gets the 900P part of its name from Calibre 9P, which was the first ultra-thin hand-wound movement made by Piaget in 1957. In a fascinating bit of engineering, the watch case and watch movement have become one as Piaget has seemingly shaved every last hundredth of a millimeter from the total depth of the watch. Let’s take a closer look, shall we?

38mm white gold case + movement (3.65mm thin, 145 total components), black coated movement, power reserve 48 hours, frequency 3Hz/21,600vph, offset hours and minutes subdial at 10 o’clock.

Some of the various 145 parts composing the Altiplano 38 mm 900P have been trimmed to a size sometimes barely thicker than a hair’s breadth – some wheels measuring a mere 0.12 mm thin (compared with 0.20 mm on a classic movement). The back of the watch actually doubles as the mainplate of the movement; the bridges and gear train are on the dial side and visible to the observer (an aesthetically pleasing detail, I might add!).

Moreover, Piaget has devised a suspended barrel hanging from a single bridge on the dial side, contrary to classic barrels that are also fixed to the mainplate side. Despite all this, the watch still is able to deliver a fairly generous power reserve of around 48 hours.

There’s one last and not-so-easily-visible detail worth noting here: Piaget has come up with a patent pending device representing what it calls a “major breakthrough” in ensuring the reliability of this type of ultra-thin watch:

“Instead of fitting the hands above the bridges, Piaget has placed them underneath, thereby freeing up space between the cannon-pinion and the crystal. When the latter is deformed by the effects of pressure, it presses not on the hands – placed below the bridge level – but instead on the wheel-train bridge, thus avoiding any consequences on the rate of the movement.”

As I understand it, the underlying idea here is to eliminate the potential movement-stopping effect of the crystal pressing on the hands due the application of pressure to the watch case (from water immersion or otherwise). Ultra-thin watches comes with there own unique set of engineering and design challenges and this seems a clever solution to just such a challenge by Piaget.

The finishing of the watch appears also to be uncompromising — black screws, satin-brushed and sandblasted surfaces, sunburst or circular satin-brushed wheels, bevelled and brushed bridges and more can be observed on the new Altiplano 38mm 900P.

Overall this is clearly a watershed moment for Piaget as it continues to define itself as the leader in ultra-thin watchmaking. This is a fantastic and stupendously beautiful watch that clearly required massive collaboration between everyone at the manufacture’s La Coate aux Fees and Plan Les Ouates locations. Nicely done, everyone!

words by Kyle Stults

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