Up until last week Piaget held the record for the thinnest mechanical watch in the world at 2 mm thick. With the release of the Bulgari Octo Finissimo Ultra at 1.8 mm in thickness, the Piaget Altiplano Ultimate Concept has been dethroned from holding the record for the thinnest mechanical watch. Despite that, we still like the AUC better and we think it will always remain as the watch that became the thinnest mechanical watch before any other.