According to the news, TAG Heuer is timing the release of
the V4 to coincide with the company's 150 year anniversary.
The Monaco V4 will be the world's first mechanical watch with
a "belt-driven movement and linear winding mass".
The V4 will be produced in a very limited edition of only
150 pieces, has been in the making for 5 years.
A ingot slides back and forth in a central channel at the
back of the watch, capturing power from the wearer's wrist
movements. The ingot is machined with teeth along one edge
that engage a cog at the side of the channel, rotating it
with each pass.
Four synchronized barrels, each containing a metal spring,
store enough energy to run the V4 for 50 hours. The barrels
turn the movement using 13 0.5mm wide belts tightened with
minuscule turnbuckles to a tension far beyond what jeweled
pinions could sustain.