amanico[JLC Moderator]
404677
Jose is right on many things, here. I know some of the documents he posted, and discovered some others thanks to his article, about the FF.
And as Jose said, the first true diving watch was the Ref 2533, from 1935 / 36. A Rolex, which announced the Radiomir with wire lugs we well know.
The first modern diving watch certainly is the Rolex, 6204 or 6200 that I don't know.
Indeed, Blancpain didn't come with the FF before 1954, and most probably 1955. So a good year AFTER the Rolex Sub.
Good job, Jose. Very good job.
Best,
Nicolas