I don't have any idea about why cards are listed as SPs. The PSA site says the cards were released in two series each 48 cards. All the SPs are second series cards numbered 49 and above. There appears to be some uncut or partial uncut sheets out there. Most/all of the uncut sheets I saw were 24 cards so maybe each series was printed on two 24 card sheets?
Larry
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Member of OBC (Old Baseball Cards), the longest running on-line collecting club www.oldbaseball.com
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