Afraid I have to agree with Scott and Phil. I have never seen an "S" like that in a Koufax signature from the early-mid 60's, which is when he was signing his "K" in the style on your card. He was no longer using that version of "K" after 1964 or so. Also, the "Sandy is almost always very straight as if he was signing on lined paper, yours seems rather sloppy compared to his normal. Could have been signed while he was walking, but not his normal signature.
Rick
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