Born in 1961, the Vulcain Nautical is the first Compressor Case Diving Watch with Alarm.
Not the first vintage diving watch with an alarm, since the place is held by the Jaeger Lecoultre Deep Sea alarm ( 1959 ), but made two years before the first protos of the Polaris, in 1963.
Compared to the Polaris, it has a decompression scale.
A legend in the universe of vintage diving watches.
I now have to do two things:
1/ Harassing its owner to let it to me.
2/ Finding a set of proper hands.
For the rest, nothing to reject. The case is in superb shape, the dial, too.