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EXTREMELY FINE. A SUPERB EXAMPLE OF THE 1907 ONE-CENT BALBOA WITH INVERTED CENTER AND OVERPRINT READING UP. ONLY 22 COPIES ARE KNOWN UNUSED.
According to Canal Zone Stamps, one pane of 100 was printed. It was sold in March 1909 to the Panama Railroad Co. and all but 22 copies were used before the error was discovered. Only about thirteen used copies were recovered after the error was noticed.
With 1969 A.P.S. and 1999 P.F. certificates. (Image)