Was just on the 'Bay and ran across a signed 1969 Topps McCovey and Marichal, thought the thumbnail looked iffy in the list, so I clicked on it and could tell right away it was bad looking at the bigger photo.
Turns out the seller is littball99 - thought that name sounded familiar.
And the guy has it listed as a 1964 when it is a 1969 card.
Looking at some more of his stuff, I do see some legit autos. I think some of these eBay sellers just buy collections and list them with little knowledge of the legitimacy of the autos. No excuse though.