VERY FINE AND CHOICE. AN EXCEEDINGLY RARE BLOCK OF FOUR OF THE 5-CENT BLUE "CANAL ZONE" INVERTED. A WONDERFUL SHOWPIECE.
One pane of 100 was printed. Multiples are extremely rare.
From our 1976 Rarities sale. HFC backstamp. With 2003 P.F. certificate. Scott Retail as singles
VERY FINE. ONE OF TWO RECORDED PAIRS OF THE 5-CENT BLUE "CANAL ZONE" INVERTED ON COVER. A GREAT RARITY OF THE ISSUE.
One pane of 100 was printed. Covers are known used on July 8 and July 9. The other recorded pair on cover, ex Plass, was also used on July 9.
Signed J. C. Perry on back. With 1969 A.P.S. certificate.