MY guess is that he was signing at a show that day and/or that it was the anniversary of him getting 383SO. Interesting way to try showing that it was signed on the anniversary.
Except it doesn't really, because the postmark doesn't affect the signature. That would tie the signature to the ball on that date, but it would look awful.
Doing this was really popular when they came out with "new" 2 dollar bills in 1976. And of course, there are loads of covers for events.
I'm not sure what I think about the stamp on a ball. It's pretty strange, which I like, but it also doesn't make much sense and doesn't look good.
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