Here's another example of a slabbed GAI certed Derek Jeter forgery.

This Derek Jeter forgery is listed by Ebay seller Clayton_Flash.

These slabbed forgeries certed by GAI were produced in high quantities. 

Derek Jeter, Walter Payton and Brett Favre were the main athletes that were forged on various cards.  They were produced in the thousands.

http://www.ebay.com/itm/1992-Score-Select-Derek-Jeter-AUTOGRAPHED-a...