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Thanks for the inquiry! The market for 1960s sports memorabilia is often dependent on the success of the sports team for that given season. I searched through auction records and another 1963 team-signed Cleveland Browns football sold for a bid of $250 against an estimate of $500 to $750 at auction earlier this year (see: https://www.liveauctioneers.com/item/37582069_1963-cleveland-browns-team-signed-football-39).
For a retail replacement insurance value, $750 should be sufficient while for resale, $200 to $400 would be reasonable to expect.
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