Gold Cal 8521 from 1950s - fish or no fish, please?

Grateful to everyone for help, please. I'm looking at a gold-cased Cal 8521
(i.e. non-Ingenieur) from the 1950s. I can't work out whether it should have
the fish logo on the crown or not. I doubt whether the watch was marketed as a
waterproof model when it was new, but I have seen similar pieces that do have
a fish.Please, does anyone have a detailed knowledge on this?
Thanks, friends!