1966 REGISTERED AIR MAIL LONDON TO USA/2/6 CASTLE USAGE. Envelope sent registered air mail London to Lenox, USA with 2/6 Castle (small surface rub) also Wildings 9d and 1s cancelled REGISTERED/LONDON CHIEF OFFICE date stamps 29 SEP 66. On reverse LENOX/MASS. receiver OCT 1 1966. At left "E CROWN R..." resealing label, envelope opened due to currency restrictions at this time. (Ref 109602).