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VERY FINE APPERANCE. A RARE EXAMPLE OF THE 12-CENT WITH "ZONE" OVERPRINT INVERTED. ONE OF ONLY SEVEN USED EXAMPLES RECORDED.
According to Canal Zone Stamps, this error was not noticed until June 1926, almost two years after it was issued. Only three unused and seven used copies are known. A stamp often missing from even the most advanced collections.
Ex Brooks. With 1973 P.F. certificate (Image)