Thanks Matthew. I haven't found out anything more about the signature in the book.
Given that there are now three copies of this style, it may be there was another signer for Jackie back around when the book was issued. The aging of the signature in my copy certainly appears consistent to the late 40s or so.
Likely impossible to determine who the actual person was who signed, if it's not Rachel's ghost signature (and I don't know what that looks like, although comments above state it isn't). Perhaps another done by a clubhouse boy or team employee.
Max
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