World War II, German censor 'e' Frankfurt/Main, collection with 26 letters, well described on exhibition pages, including Riemer E-22 red on card Switzerland-Hannover 25 July 1942, Riemer E-34, L.e. on letter Chile-Berlin November 1940, red cancel Zurück unzulässig.... (Riemer unknown) on letter Berlin-Bordeaux December 1943, Riemer E-76 Ohne Inhalt eingegangen on letter Greenland-Danmark October 1940 and on registered letter Vaduz-Wien April 1941, Die Beantwortung dieser Sendung... (in Riemer unknown) on card France-Wien September 1942, Riemer E100b grün Der Zollstelle vorführen