CHINA, EURASIA, 18.8.1932, Trial flight Lanchow - Tihwa, cover to Peking on exhibition sheet with detailled description of the transportation difficulties (crash, caravan, etc.) receiver Peking 2.12.1932
6; Flugpost; FLUGPOST INTERNATIONAL; Alphabetisch nach Ländern
6; Airmail; AIRMAIL INTERNATIONAL; Allgemein