I'm not talking about swimming/skin diving, but just heavy rain, etc. I'm a lover of hiking, and I usually don't take a chrono (Autavia etc) with me as I'm afraid that even light rain might seep in somewhere. Am I being over cautious..

I know they are vintage & some might say avoid moisture at all costs, but I'd like to know that they can stand up to rain etc - ie. non pressure waterproofness.

Cheers
Stewart