Hong Kong. (Shanghai Defence Force). 1931. Great Britain registered postal stationery envelope 4 1/2d lilac cancelled by 'Army Post Office/ 1' double ring '12th June 31' with provisional registration label, addressed to Birmingham, endorsed 'via Siberia' with Sutton Coalfield arrival on face. Army Post Office One headquarters at Kalee Hotel, Shanghai. Very scarce item of British stationery registered mail paying the correct postage plus registration fee.