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VERY FINE AND CHOICE. THIS IS THE UNIQUE PLATE BLOCK CONTAINING THE "CANAL ZONE" OMITTED ERROR. ONLY TEN WERE PRINTED.
According to Canal Zone Stamps, the error was caused when the sheet was misfed into the press. The overprint was omitted from the bottom row of the plate.
Ex Plass and Drucker. Illustrated in Canal Zone Stamps on p. 167. With 1967 and 2003 P.F. certificates. (Image)