horizontal pair, left stamp the colon between right "Panama" and bar variety (2a.2), tied to cover to Colon with July 9 Ancon datestamp alongside, postmarked Cristobal the same day and backstamped Colon July 11, very fine and extremely rare, the colon variety only occurs at positions 44 and 49, as only one sheet of 100 was produced with the inverted overprint just two stamps with both the colon and inverted overprint can exist, an extraordinary, unique first issue cover with an impeccable provenance, ex-Helme, Conger, and Tows, signed Perry