Lot 6073
Undercover Mail via P.O. Box 164: 1942, 16.10., letter sent from "KØBENHAVN 16 OKT 1942" to Portugal with German censor label of Munich and boxed "Zurück an den Absender" alongside. The only known cover which was stopped by the Censor Board in Munich and returned with inserted leaflet "Any communication with hostile foreign countries is punishable"
