VERY FINE AND CHOICE. THIS IS THE FINER OF THE TWO RECORDED EXAMPLES OF THIS RARITY. AN IMPORTANT CANAL ZONE RARITY.
The other example, ex Plass and Drucker, has a small thin spot and light corner crease. Illustrated in Canal Zone Stamps on p. 19. With 1995 P.F. certificate
VERY FINE APPEARANCE. ONLY TWO EXAMPLES OF THIS GREAT RARITY ARE KNOWN. BOTH ARE USED.
The other example of this variety has a lighter second overprint, and a faint cancel. In Canal Zone Stamps, the authors speculate that the second, clear impression of the overprint was added when the original overprint was deemed unreadable.
Ex Plass. Illustrated in Canal Zone Stamps on p. 19. With 1967 P.F. certificate