I usually stick to buying only vintage Koufax signatures because it is slightly easier to determine if they are legit, but even then it is difficult to know if it is secretarial because his signature changed over the years he was playing. Plus I think his vintage signature is better looking.
But I believe 8, 9 and 13 are fine, and maybe 11, 14 and 15 as well. Don't like the rest.
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