I bought this 14" x 5" used in the 80's. I don't see any markings. It seems to be COB because a frig magnet doesn't stick but has a little attraction. Unoriginal throwoff, but I might have the parts stored.
Can you tell:
* What era/model?
* What are those 'isolation washers'?
** Is there a decent, cheap, and easy way to clean it up without fully disassembling it?
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And I get "Reported Attack Page" warnings when I click on some of the "Important Web Site Pages" links (using Firefox). What's up with that?