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I've never had it, but there's supposed to be a very typical smell.
Do a search on celluloid rot, there's plenty being written about it.

About the "bad" Bartmann's: see it this way, even if you...

You've been verrrry lucky I didn't spot those on the bay !!
I have one myself and paid way too much for it ....

Except for gently washing with some soap I don't see a solution for the rust....