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andy beckeri would agree with barry on red cobb price in the early 1980's.....more as the decade wore on....but $80-$125 sounds right.
as a side note, the red portrait cobb has always been a "sexy" card....and sold for a huge premium back then.
in the same era an e92 cobb was $25.
scd is good too, but i would say serious collectors were participating in sales and auctions from "the trader speaks", a publication that ran from the late 1960's to the mid 1980's.
my thoughts, good luck on your book.