In recent years (at least the past 10) I have never seen anything referred to as water proof. My guess is there is too much liability with a claim of water proof. Every watch I've owned has always been water resistant to a certain depth, even if it is a dive watch.
A Rolex is water resistant so long as you don't unscrew the crown to change the time. The same is true for non-dive
Suunto instruments - they are not designed to be operated under heavy water pressure, even though they can take the pressure if you are not pushing the buttons.
Suunto has a very successful dive line, which is specifically designed to operate under water.
I've never had a leak in any of my
Suunto's, and have used them in the pool/shower etc - but when I go diving - I where a dive watch.