Hey Guys, just thought I'd pass along some more Dumble font info. I was looking at the old H.A.D. youtube clips posted in this thread. The "Overdrive Special" font on the amp is Cooper Black, which was pretty popular in the 70s (especially for things geared towards kids, like toy products and Sesame Street). It has a big, fun, playful quality about it. Anyway, I've attached a preview gif and the font if anyone is looking for it.
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Regarding Airstream, while it's similar to what's used on the 80s plates, if you examine the letter shapes, you can see it's not quite right. Look at the capital "B" in "By" for example and compare them.
Those fonts are more like standard LCD (clock radio) type styles. If I'm thinking of the font you guys are looking for, it's the old computer style font that they use for checkbook numbers, right? Something like Linotype's Data 70 or the free Checkbook font would work, I'd imagine. I haven't compared either to the real deal so not sure how "exact" they are but it's the same type of font.