I assume the moisture is on the inside of the crystal (i.e., it can't be wiped away)? In that case, it's not good and indicates moisture has gotten into the watch through a bad seal or something, and you should have that checked. If the moisture is on the outside only (you can wipe it off), it's not a problem. That happens a lot when you go from a cold atmosphere (like air conditioning) into warm, humid air.
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