1962, 4c Thatcher Ferry
Bridge, Silver (Bridge) Omitted (157a). Position 40, Mint N.H. with
sheet margin at right, brilliant colors on bright paperEXTREMELY FINE. A SUPERB SHEET-MARGIN EXAMPLE OF THE THATCHER FERRY BRIDGE ERROR. ONLY ONE PANE OF 50 IS AVAILABLE TO COLLECTORS.
According to Canal Zone Stamps, one sheet, consisting of four panes of 50, was printed. three panes were caught by postal authorities, while the fourth pane of 50 was sent to H.E. Harris & Co. as part of a larger order from the Canal Zone Philatelic Agency. At the same time this error was printed, the U.S. had issued the Dag Hammarskjold error in huge quantities. The Canal Zone authorities made plans to do the same, but they were successfully sued by H.E. Harris, and the larger printing never took place. The pane was broken up in 1969.
With 1985 P.F. certificate. (Image)