fresh and fine example of this elusive variety tied to cover to Dr. Mohr in Cristobal, "Canal Zone Ancon Jul 9 1904" handstamp and postmarked Cristobal the same day, very fine and rare, this variety occurred at positions 5 and 10 on some sheets, the actual number recorded is far fewer than the 100 suggested by Scott, ex-Plass, signed Perry (Scott $550 for used)