Ah! Thanks for the heads-up. As with most
Suunto wristops (except for the dive computers, natch), the
Core is water resistant, but buttons should NOT be pushed underwater. I have updated the specs on the
Core page you referenced.
Meanwhile, I don't have
Vector dimensions in front of me at the moment, but the impression is of the
Core being thinner in profile (thickness) and perhaps a bit bigger in diameter.