TAG Heuer type determination by case and clasp code

The first letter stands for the type.

This can be W (for watch) or C (for chronograph).

The second and third letters represent the series.

There are many letters that can stand for the series, including AC (Formula 1), AF (Aquaracer) and AH (Formula 1).

The first number represents the movement. For example, 1 stands for quartz and 2 for automatic.

The second number represents the size. For example, C stands for Kingsize Carrera.

The third number indicates the case type. For example, 4 stands for rose gold.

The last number represents the dial. This number is usually 0. Important to note: TAG Heuer changed the format of its serial and model reference numbers in the early 1990s. Therefore, some watches may have numbers in different formats. This means that for older models, your watch may not match the formatting mentioned above.

Source: Watchesoftoday.com