Red Sox Late 1940's Game Used Jersey

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I noticed most if not all game used jerseys have a stitched in name on the inside of the collar with manufacturer/distributor and size. In this case mcauliffe/wilson. I am looking at a Red Sox one that has the player who signed it on the inside collar instead of a sewn in name tag. The signature has been authenticated. But I want to know if it's a actual game used jersey from that player. Is it common place of un heard of that a player would sign their name on the inside or do they typically have stitched in names? Is this something that might have been in Spring Training? Any info or suggestions I appreciate and thank you in advance.