text: Recovered/Salvaged Mail) BOAC COMET Jet Liner DH 106 crash on take off from Dum Dum airfield, Calcutta, on a flight from Hong Kong to London, imprint airmail etiquette cover, franked $1 HK stamp, fine strike violet cachet "SALVAGED MAIL/Comet Crash, Near Calcutta/2nd. MAY 1953", fine.