TAG Heuer Monaco Evergraph Pushes the Square Chronograph Forward

The Monaco has always been TAG Heuer’s most defiant chronograph, a square-cased disruption that never tried to look like anything else.

For 2026, the Monaco Evergraph moves that idea from styling into mechanics, introducing a new chronograph architecture inside the Calibre TH80-00.

Its headline act is a compliant chronograph mechanism designed to improve quality, durability and precision, while giving one of watchmaking’s most tactile complications a different mechanical feel.

At a glance

The Monaco remains TAG Heuer’s natural test bed

The Monaco’s place in TAG Heuer history was secured early, when the reference 1133 arrived in 1969 with a water-resistant square case and the self-winding Calibre 11 chronograph movement.

Its left-side crown, sharp geometry and eventual association with Steve McQueen gave it a cultural profile that most sports chronographs never reach.

More than five decades later, the shape has barely softened, yet the collection has absorbed a wide range of materials, dials and movements.

That makes the Monaco an unusually good platform for TAG Heuer’s more experimental work, because the design already carries a sense of mechanical nonconformity.

A compliant chronograph mechanism changes the architecture

The Monaco Evergraph’s key development is its compliant chronograph mechanism, created over five years within TAG Heuer LAB.

Rather than relying on the usual network of levers and springs for the start, stop and reset functions, the system uses two flexible bistable components.

One component governs start and stop, while the other handles reset.

A bistable mechanism can rest in either of two stable positions without requiring continuous energy to hold its state.

In the Evergraph, that principle is applied at a microscopic mechanical level, replacing much of the conventional chronograph control architecture with components that flex and switch between positions.

The parts are made using high-precision LIGA technology, a process combining ultraviolet lithography and electroplating to create exceptionally precise, intricate components.

The goal is not visual novelty for its own sake, but a chronograph system with less friction, reduced lubrication demands and fewer adjustments during production and ownership.

For the wearer, the most immediate promise is consistency.

The pressure required to activate the chronograph is intended to remain the same from its first use through years of operation, with a smooth pushpiece action that separates it from the notchy feel of many traditional chronographs.

Inside the Calibre TH80-00

The Calibre TH80-00 is more than a showcase for a single mechanism.

TAG Heuer has equipped the movement with a carbon balance spring, a silicium escape wheel and a silicium pallet lever.

Its balance runs at 5 Hz, a high frequency that suits the precision-focused character of the watch and gives the chronograph a more technically serious foundation.

The movement is also COSC certified, placing the Evergraph in a category where experimental engineering is backed by independent chronometer testing.

Development was carried out in close partnership with Vaucher Manufacture Fleurier, a specialist with which TAG Heuer has recently worked on advanced chronograph projects.

That partnership matters because the Evergraph is not simply a modified Monaco with a new dial treatment.

It is a statement about where TAG Heuer sees the mechanical chronograph going, particularly at a time when many brands treat the complication as familiar territory rather than a space for structural reinvention.

Details & Specifications

The Monaco Evergraph will appeal most to collectors who see the chronograph as a living mechanical discipline rather than a settled formula.

It keeps the Monaco’s familiar silhouette intact, but the real story sits beneath the dial, where TAG Heuer has treated one of its signature complications as something still worth rethinking.