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AnonymousThe blue Seaver is just a regular 1971 card missing the black ink. Underneath the black ink on 71’s there’s the blue dot pattern you see above. If you look closely at a normal 1971 card around the lettering and inner white border you’ll see traces of the blue dots at spots.
Here's a picture borrowed from a Topps Vault auction showing a 1970 Seaver version which you don't see every day.