A waterproof speedmaster?

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You'll be fine. Just check the seals once a year.

OR the very moment you see moisture under the crystal! And be prepared to shell out when it comes time to seal it again!
 
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What about a Seamaster Chrono? Surely hardier and more water resistant than a Speedy Reduced?
I second the seamaster chrono. They claim you can even use the pushers underwater. Here's mine: