China. (Great Britain). 1948. Air Mail envelope addressed to Shanghai, China bearing Great Britain SG 475, 1s bistre tied by Selby/ York double ring, underpaid with framed hexagon 'T' hand-stamp and endorsed '2.6000' in blue ink and bearing on reverse China postage dues SG D924, $2000 purple (block of 10 with right sheet margin and strip of three) applied and tied by Shanghai receiver '18th Sept 48' on reverse.
Scarce use of postage dues during the communist conquest and post war inflation period.