Came across something interesting while I was collating a 1980-81 OPC set, I noticed that the numbers on the back of the cards are in two different font sized and then I realized that when Topps would send the printing plates to OPC, they would change the numbering scheme to suit thier own set of cards, although they would leave most of the numbers the same.
It would seem that the 200's and into the 300's have this smaller numbering font...somewhat surperfluous info, however interesting.
![[linked image]](http://i431.photobucket.com/albums/qq37/BobbyB_photo/differences.jpg)