I love Error Cards and I got the Topps: Jeter, Mantle & Bush card yesterday at a card shop!
Topps employee puts all three together via digital manipulation
Clay Luraschi, Topps spokesman said
Somewhere in between the final proofing and its printing, someone at our company - and we won't name names - thought it would be funny to put in Bush and Mantle. ... It's in the set and it's funny. It's caused quite a stir.