Al, without getting too far into it, you are basically correct that the W575-1A checklist will look very much like the E121 Series of 80 set.
It is a little more complex than that as in order to understand the checklists of the different sets, you have to know what the timeline of the "E121 like" card. The blank backed (W575-1A set was initially produced even before the E121 Series of 80, so there will be players in the W575-1A set that had been dropped by the time the E121 cards (80) were made (they were being made roughly the same time as the Holsum/Herpolsheimer cards) and the blank backs continued through the beginning of when the E121 Series of 120 were being produced. However, the W575-1B cards were all made at the end of when E121 Series of 120 was being produced.
-Rhett
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