cover 1933 (25 May) "Panton" envelope to Cayman Islands, bearing 1931 (Aug.) Air ½d. tied by Rabaul c.d.s., showing "T" in circle, manuscript "TAX 3d" and bearing Cayman Islands 3d. applied and cancelled on arrival; also 1951 (Aug.) envelope to U.S.A. bearing Australia ½d. and 3d., showing two different due h.s. and bearing U.S. Postage Due 4c. (4)