Official window envelope sent from the Local Government offices in Frankfurt (Oder) to an unknown recipient. Featuring official 12 Pf postage stamp (Mi.138) with special cancellation reading, 'Vermeidet/ Verkehrsunfälle,/ sie schädigen/ die Volksgemeinschaft' (Avoid traffic accidents, they damage the people's community) Ref: 15.12.1936, JB:227/824