How a mechanical 1/100 second is even possible
A standard 28,800 vph chronograph (the rate of a typical Valjoux 7750 or Zenith El Primero at 36,000 vph) ticks 8-10 times per second; the chronograph hand can show 1/8 to 1/10 second resolution at best. To display 1/100 of a second mechanically requires the escapement to oscillate at 50 Hz (360,000 vibrations per hour, or 100 ticks per second). Running a watch escapement at this frequency consumes massive amounts of energy: TAG Heuer's solution in the Cal. 360 was to build two completely separate trains in the same movement: a conventional 4 Hz time train, and a high-frequency 50 Hz chronograph train that runs only when the chronograph is started.
In the Carrera Mikrograph
The Cal. 360 made its production debut in the TAG Heuer Carrera Mikrograph in 2011 (after years of prototype development since the 2005 unveiling). The watch is a 43 mm Carrera with a black or silver dial showing the high-frequency central chronograph hand, a separate sub-dial for the running seconds (driven by the time train), and the chronograph 1/100 second scale around the dial. Limited production at launch (~150 pieces); subsequent variants in pink gold and platinum followed. The Mikrograph was the public face of TAG Heuer's "Mikro" research programme.
The Mikro programme: 1/1000 and beyond
The Cal. 360 was the first commercial output of TAG Heuer's "Mikro" research line. Subsequent prototype calibers pushed the resolution further:
- Mikrotimer Flying 1000 (2011): 1/1000 second resolution, escapement at 500 Hz
- Mikrogirder (2012): conceptual 1/2000 second using a magnetic-pulse oscillator instead of a balance wheel, abandoned for production but technically remarkable
The Mikro line was discontinued by TAG Heuer around 2014-2015 as the brand refocused on more commercially-mainstream calibers like the Heuer 02. As of 2025 the Cal. 360 remains the only commercially-shipped TAG Heuer Mikro caliber, making the Carrera Mikrograph the surviving production example of the entire research programme.
Why no one else did this
Mechanical 1/100 second chronographs are technically extraordinary but have a very limited market. The chronograph cannot run for long (the high-frequency escapement drains the reserve in approximately 100 minutes); the 1/100 reading is difficult to interpret on a small dial scale; and the use case (precision sports timing) has been completely served by quartz / electronic timing for decades. The Mikrograph was therefore a haute-horlogerie engineering statement rather than a practical instrument; TAG Heuer's message was that a TAG manufacture caliber could match the technical ambition of any Swiss house. After 2014 the brand pulled back from this positioning and focused on the volume Heuer 02 column-wheel automatic.
Where it sits
The Cal. 360-equipped Carrera Mikrograph traded at retail of approximately USD 50,000-65,000 at launch (2011-2014). Used examples on the secondary market are now around USD 18,000-28,000 depending on condition. The Cal. 360 is a niche caliber: very few exist, service is exclusively through TAG Heuer Switzerland, and parts availability is limited. For collectors of "weird" modern Swiss watchmaking, the Cal. 360 sits alongside other technical statement pieces (the F.P. Journe Centigraphe, the AP Royal Oak Concept Tourbillon, the Greubel Forsey Double Tourbillon) as evidence of what the modern Swiss industry can do when it puts engineering first.
