I'm no lawyer but I think Jim is right though I understand what whunter is saying about not being able to require Model-T's to pass an emission test. Clearly there was no emission testing back then, but I think you (whunter) are wrong about the year 1985 as the start of emission testing. It was definitely way before then, otherwise why do my 82 and 83 cars have emission tags?

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL