IMO, with OPC's 5% print run compared to Topps, all of the 71 OPC hi and semi-high #s are SPs. I have about 30 hi and semi hi #s, and they were all tough to find. Completely an assumption on my part, OPC likely used the same sheets as Topps since most all of the 752 cards were the same from the Topps set to OPC set. If OPC did indeed use the same sheets, then the same 54 or so SPs from 71 Topps would be SPs in the 1971 OPC set.
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