You've Never Seen One: 1950 R423 BLUE Back Strip (PSA), Gehrig/W. Johnson
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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