Not seen that model before but Mathey Tissot is a great heritage brand that also manufactured watches on behalf of Breguet for the French Air Force (Type XX chrono). Some of their vintage pieces go for 5 figures.
Nowadays they make a range of inexpensive Rolex clones interspersed with some reissues of their famous heritage pieces at high prices (some up to £6k).
Some noise around that they may be acquired by one of the big luxury watch groups as they are a historically significant brand.
Massena Labs have done some collabs with them recently on some of their heritage pieces (Type XX chrono as well as the Mergulhador Diver).
Here is a link to your watch with specs.
https://www.matheytissot.com/b2b/en/...0-product.html