My understanding is that factory parts ALWAYS had dates;
As far as I am aware, even GM replacement parts still had date codes.
It might not be an A-body part, but in my quest for date coded mirrors for my car, I came across many later 1970's dated NOS mirrors for F-bodies (still complete and in the box).
I have always understood that mirrors without dates were aftermarket replacements.
I believe there is a web page that a Yenko(?) guy created to disseminate GM glass & mirrors.
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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.
1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)
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