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FINE AND RARE. ONLY THREE EXAMPLES OF THE "ZONE CANAL" OVERPRINT VARIETY ARE RECORDED.
Unlike many other overprint varieties of this type, this one was caused not by a shift in the overprint, but rather by the mistaken use of the slugs on the overprint form.
Ex Plass and Drucker. Illustrated in Canal Zone Stamps on p. 159 (detail). With 1967 and 2003 P.F. certificates. (Image)