4. Tag Heuer Monaco V4
In 2004, TAG Heuer changed the course of watchmaking by unveiling the Monaco V4 Concept Watch.
It is the first watch in the world that makes use of transmission belts instead of pinion wheels in the movement.
The watch was designed by Jean-François Ruchonnet with the help of independent master watchmaker Philippe Dufour, and the mechanism was inspired by the movement of an automobile engine.
The Tag Heuer Monaco V4 is powered by four barrels storing 375 g of energy each, that is visible through the back.
“This breakthrough innovation redefines the accepted conventions of watch engineering and aesthetics.” Tag Heuer states.
You can buy this watch for $47,500