The most technically interesting part of the new Monaco Evergraph is invisible from across a room. Inside the familiar square case sits the new Calibre TH80-00, which replaces many of the traditional levers and springs of a chronograph’s start, stop, and reset functions with flexible bi-stable components, a compliant mechanism of the kind more familiar from aerospace engineering than watchmaking.
The movement runs at 5Hz and uses TAG Heuer’s carbon composite hairspring for magnetic resistance. It was developed within the TAG Heuer Lab in partnership with Vaucher Manufacture Fleurier, per Robb Report, and the openworked dial places the barrel, gear train, and escapement on display. Chronograph architecture has been fundamentally stable for a century; this is one of the few genuinely new answers to it.