Question for the old timers about numerical grading, Redfield dollars, and the ANA Grading system.

Abe Kosoff was asked by ANA President Virginia Culver in 1973 to help create the ANA grading standards. The book was not published until 1977.
The Redfield dollars with numerical grading on most came out in 1976. Did Paramount decide to use numerical grading because it knew that the ANA was going to adopt numerical grading, or did the ANA adopt numerical grading because Paramount had already started using it?
TD
Numismatist. 50 year member ANA. Winner of four ANA Heath Literary Awards; three Wayte and Olga Raymond Literary Awards; Numismatist of the Year Award 2009, and Lifetime Achievement Award 2020. Winner numerous NLG Literary Awards.
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Comments
If he worked for Paramount then, Tom Mulvaney might be the only person alive who might know, but he would have been quite junior at the time, so quien sabe?
I think that Paramount was using the Sheldon grading numbers before 1977. I’d have to look at an old Paramount auction catalog that I have, but I’’m sure they were using it. I believe that I bought an 1806 half dollar that was graded AU-50 in a 1974 Paramont Grand Central coin show auction.
That is interesting. Wish I could get to the ANA Library's auction catalogue stacks.