cover MARITIME MAIL: 1873 (20 Jan.) envelope addressed to London bearing 1871-76 40c. (margins in places) tied by anchor in lozenge, with octagonal "COL.FR./PAQ.FR.N NO.5" datestamp and boxed "PD"; posted in the Boite Mobile at Saigon and carried by the paquebot "Ava". Also French Colonies 25c. cancelled by a similar paquebot datestamp. Ex J.D. Riddell. Photo