The final line on the back of each of the cards in the main set begins "c1970 XOGRAPH".

A variation set begins its final line with "XOGRAPH".

The variation set was released first with all the errors. Most of the errors carried over to the main set, but some were corrected.

There are 2 versions of every card; 3 versions if there was an error.

Hello,,,does anybody have the Seaver variation card (1970 e.r.a. of 2.81)?? thanks