Piaget Altiplano 38mm 900P Manual White Gold G0A39112 GREY BLACK CROCODILE

The Piaget Altiplano 900P represents a significant technical achievement within the brand’s ultra-thin collection, holding the record as the world’s thinnest mechanical watch upon its release. This reference, G0A39112, continues that legacy with a specific configuration that is particularly exclusive. The 38mm white gold case measures a mere 3.65mm in height, a result of the caseback also serving as the mainplate of the movement. The grey dial is actually the reverse side of the movement’s bridges, offering a direct view of the mechanism’s architecture, including the balance wheel at 4 o’clock. The black alligator strap provides a stark, formal contrast to the cool tone of the white gold and the technical aesthetic of the dial, completing a design that is both minimalist and mechanically transparent.

This watch is defined by its manually-wound Calibre 900P, a movement developed specifically to achieve its record-setting dimensions. The entire mechanism is constructed with a unique approach where components are housed within the case structure itself, rather than being mounted on a separate mainplate. This integration allows for the sub-dial for the small seconds to be suspended over the gear train. The finishing is executed to a high standard, with circular Côtes de Genève on the “dial” side, bevelled bridges, and circular-grained mainplate details visible through the caseback. With a power reserve of approximately 48 hours, the movement’s specifications are as focused and purposeful as its design, making it a rare and technically collectible piece for enthusiasts of ultra-thin watchmaking.

This particular example is in new, mint condition and is accompanied by its manufacturer’s warranty card. The combination of its limited production numbers, its status as a record-holder, and this specific white-gold-and-grey-dial configuration makes it a sought-after model for serious collectors. The Altiplano 900P is not a standard production watch but a statement of technical capability from Piaget, and its market position is firmly in the realm of significant modern collectibles. Its value is underpinned by its documented provenance, flawless condition, and its well-established reputation as a benchmark in ultra-thin horology.