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TO OPEN SLIT HERE SENDER'S NAME AND ADDRESS Sir Martin Davies The National Gallery London WC2N 5DN. U.K. AN AIR LETTER SHOULD NOT CONTAIN ANY ENCLOSURE; IF IT DOES IT MAY BE SURCHARGED OR SENT BY ORDINARY MAIL Form approved by the Post Office (United Kingdom) No. 1. SECOND FOLD HERE BY AIRMAIL AIR LETTER PAR AVION AEROGRAMME [[post mark]] London 7:12 PM 20 OCT 1972 M3 [[/postmark]] [[image - English postage stamp, 5p]] Mr. Germain Seligman Jacques Seligmann & Co. Ltd. Inc. 5 East 5tth Street New York, N.Y. 10022 U.S.A.