Here is one of my favorite cards and it's not a conventional baseball card.
There is a 1930's exhibit card of the great Jim Thorpe where he is wearing his Indian headdress. Pictured is a nice SGC example.
But what is much rarer and less commonly found is his matching strip card with the same image. I saw one on eBay years ago mixed in with a lot of other random period cards. It wasn't labeled in the listing at all as a Jim Thorpe card and you'd have to have seen the pics and known it what it was. I was bummed because at the time I didn't have the funds to bid on the lot. It went for a steal considering the Thorpe strip was included.
Enjoy the hobby all...it's a wonderful one.