I believe this is my oldest (memory is spotty at best, it could have been a 1960 Spahn). I picked it up from my middle school science teacher (he was my favorite teacher bar none) nigh on 22 or 23 years ago. I thought it was so cool that there was a card that folded!
Funny story about that science teacher. Rumor was that he got in trouble after I was out of middle school for splitting the lip of the principal (no one liked the guy and he wore a mustache that apparently covered the split). Whatever the real story was, he continued teaching after that for some years.