Being an heirloom I would get it serviced and pressure tested. New crystal, pushers, crown/tube . I wouldn't be too bothered about originality, I would rather it lasted another 50 years. I live in a humid area and just got an Ed White and 145.012-67 fully serviced for the same reason you had, condensation on the inside of the crystal.
No idea about servicing in Baltimore but a quick google search turned up this.
http://forums.watchuseek.com/f2/im-...area-other-watch-repair-referrals-764121.html
Put it in the oven at 125 degrees, that's a half-baked idea
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