Hey Kev!
I went through the catalog looking for 1962-1966 production, proof, and progressive sheets, and it looks like the lots offered started with material in the early 80's and worked it's way back by year to 1967. I don't see any sheet offerings for the years you were looking for - must be the ones that are out there made it to collectors through a different means, or were offered in lots not listed in the catalog.
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