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  • to discover the 900P experience
  • Merging of the calibre and the case
  • Refining of the 145 components
  • Assembling the bridges on the dial side
  • Decentring of the hours and minutes indications


Neither entirely a movement nor exactly a case – or rather both at once: introducing the Altiplano 38 mm 900P, the world’s thinnest mechanical watch. Merging the hand-wound calibre with the case elements, it is designed as a single entity in order to achieve record-breaking slenderness at just 3.65 mm thin.

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The Altiplano 900P is the culmination of over half a century of virtuosity in the field of ultra-thin timepieces, in which Piaget is the acknowledged master

  • 1874

    First Piaget workshop

    It was in La Côte-aux-Fées, a small village in the Swiss part of the Jura, that Georges Édouard Piaget sketched the first strokes of what, decades later, was to become an inimitable signature in the world of luxury and fine watchmaking.

  • 1943

    The arrival of the Piaget brand

    The La Côte-aux-Fées Manufacture now produces watches that are signed and marketed under its name, bringing the same attention to aesthetics as to technical performance.

  • 1957

    9P: the first ultra-thin hand-wound movement

    • 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. That particular mechanism measured just 2 mm thin and sealed Piaget’s destiny in the field of ultra-thin horology.

  • 1960

    12P: the first ultra-thin hand-wound movement

    • In fact, Piaget had already broken a first record in 1960, with its calibre 12P, the thinnest self-winding movement in the world, with a thickness of only
      2.3 mm. The following years were to witness new thinness records in both the hand-wound and self-winding segments, with or without complications, such as the calibre 600P, the world's thinnest hand-wound shaped tourbillon movement,
      or the 1208P, also the thinnest self-winding movement in its category, to name but two.

  • Today

    An impressive heritage in the field of ultra-thin timepieces.

    • Constantly and whole-heartedly reaffirming its single-minded passion for intricate mechanisms, the Manufacture de Haute Horlogerie Piaget has created no fewer than 25 ultra-thin calibres, out of a total of 37 movements designed and produced in-house, 14 of which have broken a thinness record in recent years and today form part of our collection.

    • Witnesses to the almost insolent success of this double challenge, all 25 ultra-thin movements have continued to be produced without interruption since they were first launched, while the calibre 430P has made its name as one of the most widely-produced hand-wound ultra-thin movements in the world, thanks to its extreme level of resistance.


Two integrated Manufactures

  • While the Altiplano 38 mm 900P merges the case and movement to establish itself as the thinnest mechanical watch, it also stems from another fusion without which such a feat would have been impossible: that of the two Manufactures Piaget.

  • Plan-les-Ouates

    The Manufacture where the cases are produced

  • La Côte-aux-Fées

    The Manufacture where our movements are produced



The combination of specialisations

  • For three years, watchmakers, case builders and designers have worked together at each stage of design, production, adjustment and finishing so as to create this marvel of thinness, Each technical choice involves an aesthetic impact and vice versa.

Altiplano 900P

At the heart of the world’s thinnest mechanical watch

  • The true secret of this extreme slenderness lies in the structure of the case itself, of which the back also serves as the mainplate. Thereby merging calibre and case, the latter was machined directly from the case-back in order to house the mechanical parts. This most complex of architectures also required the reverse construction of the movement, with bridges fitted on the dial side, thus rendering them visible and requiring close attention to aesthetics.

  • To save another precious few millimetres, the entire mechanism and the hand-fitting system are contained within the thickness of the balance-wheel itself, thus entailing an off-centred display of the hours and minutes entirely in tune with the iconic design features of the Altiplano line.

  • These characteristics are further enhanced by the entirely visible wheel-train that invites the owner of the watch to plunge into the very heart of this supremely slender and technically sophisticated mechanism. Working within this extremely confined space, 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. This highly unusual device is no way detrimental to the performance of the mechanism, since the Altiplano 38 mm 900P has a generous power reserve of around 48 hours.


Uncompromising finishing

  • While for Piaget, the extreme slimming down of the parts in an ultra-thin watch must in no way compromise its reliability, the same goes for the level of finishing. The Altiplano 38 mm 900P is no exception to the rule. Even though some of its 145 parts remain hidden from sight, all of them have been meticulously finished in keeping with the noblest horological traditions, through countless hours of patient work rendered even trickier by the extraordinary slenderness of the components.

  • Index-assembly

    The index-assembly bearing the Piaget “P” strikes a resounding signature note within this subtly orchestrated Fine Watchmaking symphony.

  • Wheels

    The wheels are sunburst on one side then satin-brushed on the other


Altiplano 900P

  • £ 25 700
  • The world’s thinnest hand-wound mechanical watch
  • Manufacture Piaget
  • Thickness: 3.65 mm
  • Calibre and case merged to form a whole
  • Number of jewels: 20
  • Frequency: 21,600 vph/ 3 Hz
  • Finishes: satin-finish circular case-back, black-treated bridges with satin-finished "sunburst" motif, bevelled bridges, sunburst or circular-grained wheels, black-treated screws, dedicated index-assembly bearing a "P" as the Piaget signature
  • Functions: hour, off-centre minute hand at 10 o'clock

The range

Altiplano 900P models

The Altiplano 900P line by Piaget features a pure modern design, distinguished by an off-centred dial alternately punctuated by single and double hour-markers in a contemporary interpretation of timeless classicism.

Share the history of the 900P

the art of the infinitely thin

the Altiplano collection

No fewer than twelve different ultra-thin calibres are majestically showcased in the Piaget Altiplano collection. The sleek aesthetics of several models are demonstrated by their elegant round or square cases in gold. Dials are equally understated with their slender hour markers.

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