1879 Envelope addressed to England, paying the rare 2d concession rate cover, franked GB 1d red (2), tied by light Panama ‚C35‘ duplex, struck twice, the cover is headed and countersigned for the concession rate for seaman Greenaway, H.M.S. Shannon, Iquique cia Panama, cover faults and reinforced folds, used abroad covers at the 2d concession rate are rare