1966 LARGE REGISTERED ENVELOPE 'O.H.M.S. RHODESIA, NYASALAND' TO SURREY, ENGLAND, WITH G.B. 10s BLUE/YELLOW POSTAGE DUE (D67). Fine very large envelope 254 x 253 mm, sent registered mail Salisbury, Rhodesia to Purley, Surrey, England with boxed handstamp 'INVALID STAMPS USED/POSTAGE DUE 10/-' with fine 10/- blue/yellow postage due affixed and cancelled 15 JU 66 date stamp. Rare commercial usage of this postage due. (Ref 145484).
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