October 29, 1923 marks the start of regular entertainment radio program in Germany. For the 100th anniversary a special stamp was released by the German Postal Service.
The stamp features the typographic message “Achtung Aufnahme! Bitte Ruhe” (the German equivalent of the “On Air” sign) on a bright red background. The sign stands as a strong symbol for the radio studio and the recording of a radio show. The typeface Guida is reminiscent of an original illuminated sign that can be found in the Deutschlandradio broadcasting center and served as a model. In addition to the stamp, two postmarks for Berlin and Bonn were created, as well as the border of the sheet of ten stamps. Printed in fluorescent red.