As many know, the 7th series checklist has two varieties: Version A has White Sox (529) and Cardinals (544) spelled out while Version B has 529 as W. Sox and 544 as Cards. Although not very scientific, a quick survey of ebay this morning revealed that the Version A is more prevalent by approximately a 2:1 ratio. Furthermore, five version A cards were found marked up to only # 522 and none of version B were found marked in that fashion. This leads me to suspect that version A was the checklist that was in the 6th series printing and version B was the checklist printed in the last printing.
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