His timeline is also correct, as I would have pegged the Mantle at 1960 if he hadn't provided you with any info as to date. Mantle's autograph went through big transitions during this time, making it easier to pinpoint a year based on style alone.
What is really interesting, though, is that Clemente gave such a beautiful signature even in this in person situation. While his signature hadn't yet devolved into the latter-day stacked scrawl it became, it's still a much nicer example than he could have chosen to sign circa 1960.
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