Hong Kong. (Forces On Western Front). 1917. Stamp-less envelope written from Lumbres, France addressed to Hankow, China cancelled by 'Army Post Office/S. 19' double ring '26/7' with 'Examined By Base Censor' label and oval 'Passed Field Censor/8492' with circular 'S' in red (Special treatment as overseas mail) and 'British Post Office/Hankow' double ring 'Sept 20' on reverse (Webb Type M). Very nice item of destination mail from the Western Front.