I have an opportunity to purchase the attached signed 1964 Topps Koufax card. The story is that the seller worked for British Airlines and got Koufax to sign this card before walking on to a flight to London from Florida . I have a number of Koufax autographs that were signed for me in the early and mid 70s. There are similar characteristics to this one, but I don't feel confident.
Your thoughts as to its authenticity are appreciated greatly.
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Thanks so much.