Left-crown TAG Heuer Monaco Upgraded

Over time, and particularly in recent years, the Monaco series has introduced right-crown versions powered by the TH20 movement. While the left-crown version is arguably the more classic iteration, it had historically relied on the Calibre 11 movement. Although the Calibre 11 is generally reliable in terms of overall quality and durability, its 40-hour power reserve falls far short of the 80-hour reserve offered by TAG Heuer’s flagship in-house automatic chronograph movement—the TH20. The best TAG Heuer Monaco replica watches at captainthewatch.is.

Now, however, the left-crown Monaco has returned with a comprehensive upgrade. TAG Heuer has successfully resolved a fundamental issue: the previous left-crown movement—which utilized a base caliber paired with a Dubois-Depraz chronograph module—was structurally constrained, making it difficult to implement specific, independent optimizations for the movement itself. TAG Heuer has now taken its flagship in-house TH20 movement and specifically tailored it for the left-crown Monaco, creating an entirely new, exclusive caliber: the TH20-11. This move thoroughly addresses the previous structural shortcomings of the left-crown Monaco’s movement architecture. Furthermore, as a tribute to the original Calibre 11, the model number "11" has been retained in the naming of this new movement.

TAG Heuer has now fully rolled out its new generation of in-house automatic chronograph movements—the TH20 series—deploying them extensively across its two flagship collections: the Carrera and the Monaco. This movement features the classic chronograph combination of a column wheel and a vertical clutch. Notably, the layout of the chronograph components within the movement is quite distinctive; the vertical clutch is deliberately positioned off-center—an uncommon design choice, though similar layouts can be found in movements such as Rolex’s Calibre 4130/4131 and Audemars Piguet’s Calibre 4400.

The new left-crown Monaco measures 39.4 mm in diameter—a dimension largely consistent with its predecessor—but the case thickness has been tangibly reduced by 1 mm, dropping from 14.8 mm to its current 13.8 mm.

The TH20 movement is the culmination of years of continuous refinement. As early as 2014, TAG Heuer introduced the CH80 movement—a caliber with something of a "concept" status at the time. This was subsequently developed and refined into the mass-produced H02 movement, before finally undergoing a further upgrade under the leadership of Carole Kasapi to become the TH20 movement we see today. The most critical upgrade involves enhancing the movement's reliability and extending its service intervals. The official warranty for the TH20 movement has been upgraded to a standard two years, plus an additional three years upon online registration—totaling a comprehensive five-year warranty—thereby elevating both stability and durability to an entirely new level.

The all-new left-crown Monaco retains the dual sub-dial layout; however, the 6 o'clock position features only a date window, distinguishing it from the right-crown version, which incorporates a hidden small seconds sub-dial at the same position. Thanks to the inherent lightweight properties of titanium—the material chosen for this new timepiece—TAG Heuer’s latest left-crown Monaco Chronograph delivers a significant and immediate improvement in wearing comfort. A look at the data confirms this: while the previous generation weighed in at 125 grams, the new all-titanium version has shed weight down to just 86 grams, resulting in a palpably lighter feel on the wrist.