70s

(x) Typeface from a Robert Crumb poster (not hand lettering). I've looked everywhere. Help me Typophile. - Marvin {Rainer}

I've seen this type many times in my youth on TV station promos and now here's a hard copy I found on this http://Robert Crumb poster. I went through thousands of online fonts (which isn't a chore, exactly) and uploaded it to the various automated type ID sites but am still without clue. I've also seen it a lighter variant.

Thanks in advance. You guys are great.