I believe the 7th series checklist was the W. Sox version while the White Sox version was printed as part of the 6th series. I base this on two somewhat flimsy pieces of evidence. First, the White Sox version appears to be available more frequently (so appears to have been printed in higher quantity) and 2nd, I have found multiple White Sox versions checked only up to #522, but not seen that on a W.Sox version.
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