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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 (Image)