On 29 August 1936, the International Federation of Philately in Luxemburg (FIP) proposed a Day of the Stamp for all countries in the federation to be held on 7 January of each year. It was changed to 10 January in 1937. There were several postal stationeries printed, but the above card with an imprinted 3 Rpf Hindenburg head stamp was the standard version used throughout Germany. It was additionally franked with a pair of Sc 415 and posted in Diiren on the Day of the Stamp. A husband apparently sent the card to his wife.
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Diiren is in northern Germany approximately 20 miles west of Koln. It is situated on the Roer River in a fertile plain. In 1937 it was a busy town of over 40,000 with manufactories of cloth, paper, iron etc. The most conspicuous object in the skyline at that time was the Gothic tower of the Church of St. Anna.