My Citizen Titanium Analog chronograph is rated to 200 meters, has seals on all four buttons, and a screw in Crown, but Citizen says it's NOT for diving. Go figure. I've had it to 100 feet, but no more. It failed a pressure test on the last battery change.
No problem, I have two computers, and would rather dive them.
So how can a watch be oring sealed, rated to 200M, and NOT be intended for diving? I have no clue, but My experience is that it worked just fine.
I'd say that MOST watches that have screw in crown's, and sealed control buttons ARE OK to dive even if the manufacture would rather change more for a *DIVE* watch.
Personally if you want something for diving, I'd suggest a computer. Or you can go with something like the Aeris Epic, or other watched size dive computers, but they are pricey.