amanico[JLC Moderator]
403084
Zenith Sub Sea Diver Chronograph A277 Cal 146HP from 1969.
A nice beast, full of character, don't you think?
Some brands made some " diving " chronos , such as Zenith and Jaeger Lecoultre ( the famous Shark ), or Breitling ( Superocean ).
I find them quite fascinating. Even if I doubt you can use the pushers under the sea...
Best,
Nicolas