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DavidFrom other examples as well, Mickey's 'M's have changed over time.
The faux signatures on old Topps cards were created from the player's actual signatures. In fact, Topps would send the players documents asking them to sign their name many times so they could be used as samples.
In general, the printed signatures on the cards are more formal (more careful, often full name, as if signing a contract) then if the player was signing a card or ball at the ball park.