1911 T201 Mecca Double Folder
Fred Clarke / R. Byrne
This cards is downright cool.
Distributed in packs of cigarettes in 1911, this issue includes two players.
The full panel is of Hall of Famer Fred Clarke. Clarke was a player/manager for four Pittsburgh pennants. He was also a teammate of Honus Wagner.
On the other side of the card is Robert Byrne, Clarke's third baseman.
When you fold the card in half, Byrne's body overlaps Clarke's and the combination of Byrne's top and Clarke's bottom produces its own image.
Pretty smart if you ask me.