Quote:
Originally Posted by RGold
The #122 Crowder card was included on the tenth and final sheet of the 1933 Goudey set. This series was issued after the World Series in October, 1933.
This card appears to be a patent card, and was stamped in January, 1934 which makes sense to me. Look at other patent cards, and you will see they are stamped some months after the issue of the cards.   
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Copyright registration card, not patent card. Different aspect of intellectual property law.
FWIW, the stamp doesn't necessarily predate or track the date of issue. It is possible to register something before or after the publication date.
I've seen a few unacknowledged copyright cards pop up on eBay recently. I snagged this one: