Air Mail Proof 1951-57 Air 6c., 10c., 15c. and 25c. imperforate proof of each on printer's cards (3), each endorsed "Approved" , one with a request for possible improvement, dated "10/10/51" , "16/10/51" and "2/10/51" respectively; also 1957 Air 4c. imperforate proof on slightly soiled card, stamped and endorsed with approval, dated "21 Feb. 57" ; five proofs in all
Air Mail Proof 1951-57 Air 6c., 10c., 15c. and 25c. imperforate proof of each on printer's cards (3), each endorsed "Approved" , one with a request for possible improvement, dated "10/10/51" , "16/10/51" and "2/10/51" respectively; also 1957 Air 4c. imperforate proof on slightly soiled card, stamped and endorsed with approval, dated "21 Feb. 57" ; five proofs in all
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