Burma. 1942. Envelope addressed to Mandalay bearing Burma SG 20, 6p blue (pair)tied by Kyukok double ring '11th Apr 42' with 'Opened by Examiner' label tied by framed 'Crown/Passed DHC/21' censor cachet and forwarded on to Bombay with receiver 'May 10'. The Only example recorded by Proud and rare retreat cover. Ex Proud.