I got this reply from a seller on ebay who has a several of the cards:
I purchased the complete inventory from Pacific
Trading Cards when they sold to Donruss and I had hundreds of these.
I have sold these for years on ebay. The SP symbol stands for Signature
Preventures.
He only has the blank-backed ones with the black border and sp logo. I'm venturing a guess that the original 8 without borders came first, then the normal cards, and then the blank backs (maybe after or around when Metallic Creations when under?)
I got my lot of the 8 originals without borders yesterday. I'll maybe try to get them scanned. They are on photo paper with blank backs and rounded corners. All the artwork is from Payette except for the Gehrig.
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