63c Dr. Jonas Salk, Black Litho Omitted (3428a).
Complete pane of 20 stamps, black lithograph printing completely omitted
on all stamps, including the "USA 63" denomination, the value table in the right selvage and in the plate nos. at top left and right and at bottom right, only bare traces of it are found in the bottom left corner numeral selvage (trace of "P2") and a few dots of the pane diagram in the bottom center selvage, bright and fresh
EXTREMELY FINE. THIS IS THE UNIQUE PANE OF THE 2006 DR. JONAS SALK COMMEMORATIVE WITH BLACK LITHOGRAPHIC PRINTING OMITTED. THIS PANE CONTAINS ALL 20 KNOWN COPIES OF THE ERROR.
The Datz Errors catalogue lists only 20 known copies of this error -- all contained in this single pane. Accompanied by a normal pane for comparison. With 2013 P.F. certificate. Listed but unpriced in Scott
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