China. (Indo-China). 1940. Envelope addressed to Hanoi bearing Indo-China SG 169, 2c green (pair) tied by Caobang/Tonkin date stamp, underpaid with 'T' hand-stamp and bearing Indo-China postage due SG D204, 4c red/yellow applied and tied on arrival by Hanoi/Tonkin receiver. Lovely item of domestic postage due mail.