Facsimile "Autographs" vs. stamped endorsements

I just saw the Warren Spahn glove in the Glove of the Week section, and it is a truly lovely glove. The Spahn endorsement got me to thinking, though ... either he had REALLY good penmanship
or that was a stamped endorsement not meant to look at all like his autograph.
When did "autograph" facsimiles become de rigeur for glove endorsements? Were there some endorsers whose "autograph" stamp was preceded by a generic type stamp? Does the autograph style make the glove more desirable to a collector?
Kind of a nit-picky question, I know ...

When did "autograph" facsimiles become de rigeur for glove endorsements? Were there some endorsers whose "autograph" stamp was preceded by a generic type stamp? Does the autograph style make the glove more desirable to a collector?
Kind of a nit-picky question, I know ...
