Blank backs are special but not that valuable. Most of them are not proofs or anything like that, just sheets that didn’t get the reverse printed. Some ended up in packs like this, others presumably were back doored. A Topps blank back of a particular card is very tough; but there’s enough that blank backs in general aren’t that rare. Since they aren’t considered needed for master sets, value is pretty low unless you hit on a huge star. I think they are a fun variant to collect
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