I would like to pick up up a '39 Williams Play Ball at some point this year. I don't know too much about the specifics of the set, however. For example, does the Williams card have a back variation? I noticed two on eBay with differences including the word spacing for the paragraph, GUM. INC., vs. GUM, Inc., and America / Printed in the U.S.A. is italicized in one, but not the other.