Fogging is caused by moisture in the watch. If the temperature differential is enough, then simple water vapour in the air inside the watch is enough to make this happen. As far as I know (and I'm not a vintage expert by any stretch - unlike some of the guys here), the 809 was never designed to be water resistant at all, so that means the case isn't airtight, which would mean fogging up is far more likely than on a modern piece.
I'll move your thread into the vintage section as the guys there are likely more knowledgeable on this issue in vintage pieces.
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