That's funny, I was about to respond to your prior posts to say that the information you've provided would lead me to conclude a private sale to the
ANS rather than a public
auction. The additional T. Buttrey "negotiations" information certainly supports a private, rather than public
auction, sale. This may not be entirely bad news, as the coins might have appeared in a dealer's fixed
price list, though likely only the best would have appeared in the plates.
EDIT: The only mid-1960s,
New York ancients dealers that I can think of are Stack's, which often sold ancients under its Coin Galleries subsidiary, and Frederick J. Knobloch who was an active collector-dealer at that time. Stack's/Coin Galleries'
price lists should be your first
search. The
ANS likely has a
complete set of their catalogues. Alternatvely, I think the
ANS has searcable online databases of large chunks of its
collection. Are the Athenian
New Style Coinage not covered in any of them?