I just noticed this thread, and thought I'd help with the research with regard to how early is "early"..
Photos below are of my 1971 M-code convertible that my dad purchased back in 1980 as a mint original car. All we ever did to it was give it a fresh re-spray (lacquer, that was the "thing to do" back then) because the original owner was so obsessive he had waxed through the original paint to the point that primer was starting to show through. Rest of the car, right down to the carpeting, is original.
And even though this car's lived a pretty charmed indoor air-conditioned life, the molding on it is there, but it's pretty chalky and tired. It'd be a neat thing to reproduce, but finding an adequate sample would be the challenge.
Last, my car was built 11/12/1970.. So I'd still say "early", but I wouldn't go so far as to say "very early".
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