While I'm being awkward here's something really unhelpful to work on.
I can confidently say that it's round but everything else is up for debate. It looks like the caseback SHOULD come off but I've scratched it once trying, can't see a notch to aim for but there is a groove. I'll show my watch guy in a couple of weeks when I see him next and update.
Hope you can make out the "BULOVA SWISS" etched on the back along with the old Bulova goddess. Other than it says waterproof I got nothing else to add sorry.