Quote:
Originally Posted by Estwd
Only one known, PSA graded: BLUE back 1950 R423 complete strip featuring Lou Gehrig, Walter Johnson and other HOFers. PSA has only graded 14 individual blue back cards from this set (12 of which I own). The Gehrig and Johnson blue backs are NOT among those that have been graded individually, so they only exist in this strip.
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Well, when something is the only one known, it is certainly rare, and while they are only KNOWN to exist on this strip, that does not mean with certainty that no others exist.
Here's the only known Ruth Blum's version 2, but I'm more confident that there are others than I am that I own the only one.
Doug