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I believe these stickers were used about 1969-1970. They have the curved printing pattern on the backing paper like other Plymouth stickers of the 1969-1970 period do. Note the place where the prep person initialed his/her name or initials and date.

I have seen similar stickers for sale on the bay without the spaces to initial in by the prep person. I believe they are from the mid 1970's.

I think the backing paper is a key clue.



Those "Road Ready" stickers are late 1970s vintage, not late 60s or early 70s.