1971 OPC Baseball High Numbers (SP)
 

Are the 1971 OPC Baseball SP High Numbers as valuable and rare, as they are in TOPPS? Are they more or less valuable?

I would check Ebay completed auctions to determine more or less valuable. Some sell for way more than Topps. I paid $100 for a NrMt #648 Mets Rookies.

As for rarity, they are much tougher than Topps version.

They’re much tougher on so many levels.
A full set in mid grade can and will run you in the $10,000 range and it’s all about it the numbers about be 528.