The 2011 version of the SCD Standard Catalog listed the 52 Mantle, Robinson and Thompson as variations. The front and back differences are obvious, and although not likely intentional, did result from a decision to double print them.
Can you imagine the anguish if PSA ever includes them in it's master 52 list causing a need to have two of each for a master set
. Since I have them I am ok with that
.
I bet it would be hard to get full agreement here on what should constitute the definition of a variation. And no matter what definition were adopted applying it in all cases would not be easy.
Anyone interested in post war variations might want to look at this project
http://baseballcardvariationsguidebo...wordpress.com/t