From the beginning, TAG Heuer has built its name on innovation, not just good design. From the oscillating pinion that shaped its early chronograph philosophy to the Calibre 11 automatic chronograph in 1969, the brand has never been afraid to rethink how a watch should work. At Geneva Watch Days 2025, that mindset was on display again, as TAG Heuer introduced what it called a “technical breakthrough that will shape the future of mechanical watchmaking.”

At the centre of this announcement is the new TH-Carbonspring oscillator. To understand why this matters, go back more than 350 years to when Christiaan Huygens developed the balance spring, a tiny but crucial part that allows a watch to keep steady time. Since then, the hairspring has been the heart of a mechanical watch, controlling the balance wheel and enabling portable timekeeping. In recent years, many brands have moved to silicon springs because they resist magnetism and require less maintenance. With the TH-Carbon spring, TAG Heuer is taking a different path, using advanced carbon-composite technology instead.

What makes this release more meaningful is that the new oscillator is not hidden inside a random model. It debuts in limited-edition TAG Heuer Monaco and TAG Heuer Carrera models, two watches with strong racing history and brand identity. With these two innovation icons, it is clear TAG Heuer is taking things in a different direction and continuing to advance mechanical watchmaking.

The TH-Carbonspring oscillator did not happen by chance. TAG Heuer spent nearly ten years working on it inside its own lab, bringing together watchmakers, engineers, and technicians to focus on one small but critical part of the movement: the hairspring. It may be tiny, but it controls the rhythm of the entire watch, and improving it is no small task.

Instead of using traditional metal or even silicon, TAG Heuer chose ultra-light carbon composite for this new hairspring. The material is resistant to magnetism and shocks, two things that can easily affect a mechanical watch. Because it is lighter, it also helps the balance wheel move more efficiently, which improves accuracy and stability over time. The idea was simple in theory, but extremely complex in practice to build something stronger, lighter, and more consistent without compromising reliability.

TAG Heuer Technical Director Emmanuel Dupas spoke honestly about the process, saying, “Given the scale and complexity of the goal we set ourselves at the TAG Heuer LAB, the innovation process has involved countless steps and at least as many failures as successes. It starts with intuition, then a hypothesis, then development, and then testing. Each result carries weight. Sometimes a result gives you confidence in your hypothesis. Other times, it goes against it, and your hypothesis breaks down. There are no shortcuts. Only hard work, backed by a healthy level of scientific doubt and the competencies of your team.” His words show that this was built through patience, testing, and learning from mistakes.

Today, the TH-Carbonspring stands as one of the brand’s biggest technical steps in recent years. TAG Heuer has filed four patents for the technology, and one has already been approved, underscoring the company’s seriousness about this development. For a brand built on split-second timing and racing history, upgrading the very heart of the movement simply makes sense, and this new oscillator shows that performance still starts from within.

To introduce the TH-Carbonspring, TAG Heuer turned to two of its most recognizable models: the Monaco and the Carrera. Both timepieces are fitted with the new TH-Carbonspring oscillator, placing this major technical step inside collections that already carry serious history within the brand. It feels intentional, not experimental, as if TAG Heuer wanted its latest innovation to live inside watches that already represent its racing heritage.

Each model is housed in a forged carbon-fibre case, keeping the theme consistent from the inside out. Carbon has long been associated with performance and lightweight strength in motorsport, so its use here feels natural rather than decorative. The textured look of forged carbon gives both watches a modern edge and reinforces that this release is about performance first.

Even the dial design reflects the technology beneath it. A subtle spiral pattern, inspired by the hairspring’s shape, adds depth without overpowering the overall aesthetic. Limited to just 50 numbered pieces each, the Monaco and Carrera editions make it clear this is not just a cosmetic refresh, but a focused technical statement built around the new TH-Carbonspring.

• Brand: TAG Heuer
• Model: Monaco Flyback Chronograph TH-Carbonspring
• Reference: CBL5190.FT6313
• Diameter: 39 mm
• Thickness: 14.1 mm
• Material: Black forged carbon case
• Dial Colour: Black carbon dial with spiral-shaped engraving
• Calibre: Calibre TH20-60
• Power Reserve: 80 Hours
• Water Resistance: 10 Bar (100 metres, 330 feet)
• Availability: December 2025
• Price: CHF ₣17’000 (Limited Edition – 50 Pieces)

The TAG Heuer Monaco Flyback Chronograph TH-Carbonspring stays true to the original 39mm Monaco shape, but the forged-carbon case completely changes the watch’s mood. It still has that bold square presence the Monaco is known for, yet the carbon gives it a lighter, more technical character. The surface has a natural pattern that makes each piece feel slightly different, which adds personality without overcomplicating the design.

The dial keeps things dark and sharp with a black-and-gold colour scheme. The hands are finished in black-gold tones and filled with white lume, so they stand out clearly against the background. The chronograph details are easy to read, and the overall layout feels balanced rather than busy. Even small elements like the crown, pushers, and indexes continue the carbon theme, giving the watch a unified look that feels deliberate from every angle.

Inside, the Monaco is powered by the in-house TH20-60 movement, a chronometer-certified automatic flyback chronograph with an 80-hour power reserve. It is a serious engine for a serious watch, offering both performance and everyday usability. The rubber strap, designed with a fabric-like texture, keeps it comfortable on the wrist while reinforcing its sporty nature, making this Monaco feel modern without losing its racing roots.

• Brand: TAG Heuer
• Model: Carrera Chronograph Tourbillon Extreme Sport TH-Carbonspring
• Reference: CBU5091.FT6305
• Diameter: 44 mm
• Thickness: 15.4 mm
• Material: Black forged carbon case
• Dial Colour: Black carbon dial with spiral-shaped engraving
• Calibre: Calibre TH20-61
• Power Reserve: 65 Hours
• Water Resistance: 10 Bar (100 metres, 330 feet)
• Availability: Q1 2026
• Price: CHF ₣40,000 (Limited Edition – 50 Pieces)

The TAG Heuer Carrera Chronograph Tourbillon Extreme Sport TH-Carbonspring feels like the bold sibling in this launch. While it shares the same TH-Carbonspring innovation we saw in the Monaco, the overall approach here is more aggressive and more technical. This is not the classic, understated Carrera most people picture. It is bigger, sharper, and clearly built to make a statement.

The case measures 44mm and is made from black forged carbon, giving it a strong presence on the wrist without feeling heavy. The carbon tachymeter bezel keeps the racing link alive with the dark theme extended across the flange and minute scale, and adds a unique characteristic, making everything intentional and performance-driven.

Inside, TAG Heuer uses the TH20-61 movement, an automatic, chronometer-certified chronograph tourbillon with a 65-hour power reserve, not as powerful as the Monaco’s but still impressive. Adding a tourbillon completely changes the watch’s tone. It takes the Carrera from a high-performance chronograph to something far more complex and ambitious, combining serious mechanical watchmaking with the brand’s racing roots.

TAG Heuer CEO Antoine Pin explained the meaning behind this development clearly: “The TH-Carbonspring is a major watchmaking breakthrough and a milestone in the history of this endlessly innovative 165-year-old company. But it’s also a story of towering mental strength and resilience. Imagine spending a decade on realising a single idea. It’s incredible. An epic, heroic achievement that only a brand Designed to Win could have pulled off. And this is just the beginning. There are many complementary technologies in the pipeline, and, in time, these will trickle down through our collections of high-performance, highly precise mechanical watches. This is avant-garde watchmaking for the 21st century. This is TAG Heuer.”

When you look at the Carrera in this form, it feels less like a limited edition and more like a signal of intent. It shows that TAG Heuer is not just updating materials or playing with design, but investing years into real mechanical progress and placing that progress front and centre.