Colombia. (British Post Offices). 1880. Envelope addressed to Paris bearing Colombia Yvert 55, 10c brown tied by oval Bogota obliterator, routed via Savanilla with British Post Office Savanilla/ Barranquilla date stamp 'Mr 22 80'. routed via London 'Ap 26' with French entry cachet, underpaid with bold 'T' hand-stamp and rated '16' with '110' in blue crayon.
Superb item posted before Colombia's entry into the UPU.