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VERY FINE AND CHOICE. ONLY TEN EXAMPLES OF THE MISSING OVERPRINT VARIETY WERE PRINTED.
According to Canal Zone Stamps, the error occurred when the bottom left pane of Plate No. 18633 was misplaced in the printing press. A block of four was offered in our Drucker sale (also ex Plass), and we have offered only one single since keeping computerized records.
With 1967 P.F. certificate (Image)
VERY FINE. A RARE INTACT BOOKLET OF FOUR PANES OF THE PERF 10 ROTARY PRESS BOOKLET PANE. VERY FEW INTACT BOOKLETS ARE KNOWN.
According to Canal Zone Stamps this was issued in both 2-pane and 4-pane booklets -- the latter is the scarcer of the two. The booklets are easily identifiable by their different colored covers. Scott Retail as four panes with no premium for the complete booklet or covers. (Image)