1921, 1c Light Green & Black, "Canal" Double (55f). Top right corner selvage at right with "Zone" in right and part of plate number at top, slightly disturbed original gum, rich color

FINE CENTERING AS ALWAYS. THE UNIQUE CORNER-MARGIN PLATE NUMBER COPY OF THE DOUBLE "CANAL" ERROR.

The Double "Canal" error was created when a second overprint was made along the righthand vertical row. The "Canal" portion of the second overprint is on the stamp, while the "Zone" portion is on the selvage. This is especially desirable with the selvage showing the "Zone" and it is unique with the light green and black plate numbers at top.

With 2015 P.F. certificate

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