1961.
Always a pleasure to see one. Even if I am not sure the crowns on this one are correct. And I have a doubt on the second hand.
Credit picture: Antiquorum.
The Vulcain Nautical is the second diving alarm watch, but the first ( and unique, as far as I know ) to offer an alarm AND a decompression scale in the same watch.
A myth in the universe of vintage diving watches.
Best,
Nicolas