Got this back today from PSA. Only ticket they have slabbed from that day.
Looked up the history and it appears that on that day on June 27, 1941:
"Fenway Park hosted two amateur baseball games including one between Massachusetts State Officials and Boston City Officials. Boston Mayor Maurice Tobin pitched for Boston while Massachusetts Governor Leverett Saltonstall played first base for the winning team that represented the Commonwealth."
Not sure how or when the MLB players signed the back but maybe they were at the park that day on their day off?
Pretty cool piece of history!
Peace, Mike
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