Piaget, a Swiss luxury watch brand, unveiled the world's thinnest mechanical watch at the third China International and Import Expo, which takes place from November 5 to 10 at Shanghai's National and Convention Center. /CGTN

Measuring only 2 millimeters thick, it is a concept watch named Altiplano Ultimate Concept. /CGTN

It took six years to create – four to develop ideas like incorporating the case into the movement and two more to engineer it. /CGTN

The size and design of the watch parts have all been readjusted to make it as thin as possible. The concept watch, which was released in 2018, can be customized to meet each consumer's requirements. /CGTN