That is my card on eBay.
Basically, I have given this particular set that designation and written about it on this forum and in an Old Cardboard article.
The W575-1 designation has become a garbage heap designation for anything resembling an E121 that has a blank or stamped back. The series of cards this particular card comes from is an exact copy of the W501 set printed on the same type of paper with the same quality printing and with the same checklist, the only difference being that the normal numbers at top of the W501 aren't there. Also I have purchased a few original collections that had these "w501-2's" mixed in with regular W501's and on a few occasions the original owner even wrote in pen or pencil the W501 number in the upper corner where it would have been found in a regular w501.
All this leads me to believe that the designation I gave them to be more accurate. If anybody was still updating the SCD Standard Catalog I would have tried to get them to update the sets but that doesn't seem to be a thing they are interested in keeping up to date.
Let me know if this doesn't answer your questions.
-Rhett Yeakley
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