TAG Heuer's Monaco V4: The first patented belt-driven watch.

The name V4 derives from the movement's four barrels, which are mounted on a V-shaped main plate angled at 15 degrees, like cylinders in a high-end motor racing engine.

The V4 throws almost 300 years of watch design out the window. The traditions dictate, for example, that a movement’s power must be transmitted by wheels; that rotating axes need to have synthetic rubies as bearings; and that an oscillating weight rotating on its own axis provides a movement’s spring barrels with energy. None of these hold true in the new V4 watch movement.





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