TAG Heuer Calibre 7

The TAG Heuer Calibre 7 is a Swiss made automatic movement based on the either the ETA caliber 2892-A2 or Sellita SW300-1 depending on the model and year of the watch.

TAG also has a high grade version of the Calibre 7 which is COSC certified.

Most, but not all of the Caliber 7 movements feature Côtes de Genève decorating on the rotor, which is also engraved with TAG Heuer / Calibre 7 / Swiss Made.

From Tag Heuer:

“All TAG Heuer automatic movements are made in Switzerland and must meet extremely strict criteria for precision before they make it onto your wrist. Their high frequency ensures excellent mechanical precision. A number of TAG Heuer automatic movements are awarded an Official Swiss Chronometer Control (C.O.S.C.) Certificate, the ultimate recognition of precision and reliability.”

When did TAG switch to Sellita for the Calibre 7?

When brands flip flop between base movements, they usually don’t make a public declaration about it. There is typically a transition period where the old movement will continue to be installed and on the market while the new ones are introduced. Also, the age of a watch is not always based on the manufacturing date, but rather the original date of sate. For this reason, it is not easy to track changes such as base movement transitions. If you know when your watch was originally sold by the AD and what movement is inside, please comment below. Such as with Rolex serial numbers, the community can work together to crowdsource this kind of information.

How to tell which base caliber is in your watch?

The easiest way to determine if your Calibre 7 powered watch has the ETA or Sellita as a base movement, is to look for the markings under the balance wheel. This guide will help you.

Another way is to look for the jewel count (in the image above, you can see the jewel count engraved along the edge of the movement). The ETA has 21 jewels and the Sellita has 25 jewels.

Additional Resources:

• Official Calibre 7 page