A decade ago at the Baselworld watch and jewelry show, TAG Heuer introduced the Monaco V4, a radical watch concept that employed a system of belts rather than gears to drive its power train. After five years of tinkering with the prototype, a commercial version was finally introduced to market in 2009. Now, in celebration of the line’s 10th anniversary, TAG Heuer has released the special-edition Monaco V4 Tourbillon.

The most revolutionary feature of the Monaco V4 line, and one of the prime contributors to …