I was trying to get a list of Mantle Topps variants in this thread
http://net54baseball.com/showthread.php?t=216063
My 1962 # 18 has the blemish. Had not heard there might be a corrected version
I have 3 versions of the 67 card, red dot on top border ( one on ebay now) or down below.
What is the 66 mark you reference ?
Nor do I have the 64 no dot after the Y in NY on back that Bob Lemke highlighted in an SCD article