Piaget - the Altiplano Ultimate Automatic 91OP trumps the Bulgari Octo Finissimo Ultra-Thin Automatique for the world's thinnest automatic watch with 4.30mm overall.
Piaget had to concoct a new construction method tp bering this incridible concept to fruition. By utilizing the case as the watch movement’s main plate, the designers were able to build watch components on top of it, instead of building a movement inside the case. Similarly, a key is used to power the watch up after it's 44-hour reverse drain instead of using a normal winding mechanism.
See the details above and you can discover our mechanical watch here.