Willi Sanke published a series of about 600-700 numbered postcards, showing World War I

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

 aviators circa 1910 - 1918/20. He was based in Berlin

Berlin

Berlin is the capital city of Germany and is one of the 16 states of Germany. With a population of 3.45 million people, Berlin is Germany's largest city. It is the second most populous city proper and the seventh most populous urban area in the European Union...

 and his cards were often issued under the name of Postkartenvertrieb W. Sanke (Post Card Distribution W. Sanke). On some of these postcards, the photographers are identified: for example, Fritz Fischer

Fritz Fischer

Fritz Fischer was a German historian best known for his analysis of the causes of World War I. Fischer has been described by The Encyclopedia of Historians and Historical Writing as the most important German historian of the 20th century.-Biography:Fischer was born in Ludwigsstadt in Bavaria. His...

, Nicola Perscheid

Nicola Perscheid

Nicola Perscheid was a German photographer. He is primarily known for his artistic portrait photography. He developed the "Perscheid lens", a soft focus lens for large-format portrait photography....

(1864–1930), and Alfred Krauth.