amanico[JLC Moderator]
400337
Mathey Tissot Type XX.
We discussed the Type XX on the Breguet forum and we had some exchanges on the fact that the Type XX was originally made by Mathey Tissot.
Originally, that can be discussed, but the an indisputable fact is that Mathey Tissot made some.
Two Sub Dials, which is my favorite,

Three Sub Dials, which I never saw in the real:

Credit: Antiquorum.
Best,
Nicolas