In 2024, TAG Heuer reached a new milestone in its esteemed history of mechanical timekeeping with the Calibre TH81-00 split-seconds automatic chronograph movement.
The rare and astoundingly intricate complication — which tracks two events that begin simultaneously but end separately, such as competing lap times — debuted in the Monaco collection, with multiple iterations following in 2025.
In what feels like a homecoming, TAG Heuer’s most impressive mechanical chronograph movement to date finally lands in its flagship watch: the Carrera. The Swiss watchmaker pulled out all the stops for what is undoubtedly the new pinnacle of this storied collection.
Of course, the beloved Glassbox variation was chosen as the foundation for the Carrera Split-Seconds Chronograph. But the 42mm titanium case allows for a slight alteration to the curvature of the sapphire crystal, which now slopes seamlessly into the case.
The curvature of the Glassbox’s signature raised flange, composed in anthracite for this reference, matches that of the crystal to eliminate parallax distortion when viewing the tachymeter scale.
The dial follows the same blueprint used for the Monaco that launched the automatic split-seconds movement, even mirroring the black, red and white color scheme. It is composed mostly of sapphire crystal, allowing for a clear top-down view of the mechanical wonder ticking away below.
