If you are curious about where some postcards were printed.Mavi Boncuk | Margarethe Fehim Pascha Postcard | Photobrom, G.m.b.H. , Wien [1]
Photobrom generally printed touristic cards and more risque Belle Epoque Bouduoir cards (sample mailed in 1908). In 1909 Photobrom GmbH produced one of the earliest films[2] in Austria, the Kaiser Franz Joseph Documentary: Die Kaisermanöver in Mähren/Royal Manoeuvres in Moravia.
[1] see a website devoted to PHOTOBROM postcards. There was one major company producing postcards in Europe: the Neue Photographische Gesellschaft | The New Photographic Company (1894-1948) (NPG), Berlin Steglitz. Founded in 1894 by Arthur Schwarz, the NPG established a several affiliated companies in European countries and were the leading producers of a large variety of postcard motifs.
Photobrom GmbH at Vienna, Austria
Société Industrielle de Photographie - S.I.P. at Paris, France
Rotary Photographic Company Ltd. at London, Great Britain
La Compagnia Rotografica at Milan, Rome, Florence, Italy
Rotograph Company at New York, USA
see also Real Photo Postcards
The founder and driving force was Arthur Schwarz (born 1862), who had established the Rotograph Company in New York for the automatic printing of photographs in 1892. The NPG was founded by Mr. Schwarz in July, 1894 in Berlin-Schoeneberg. Backbone of the NPG success were machines used for photographic paper / printing constructed after US patents but improved, however. They were built to last. Some NPG machines installed at the British daughter company Rotary Photographic Co. Ltd. were in use for over 60 years! Thanks to the various NPG patents registered between 1895-97 for many countries, Arthur Schwarz was in the position to minimise competition. NPG, with branches / associated partner companies in London, New York, Paris, Vienna, Brussels, Milano etc and a total of about 1,500 employees, played a leading role. Not only as photographic printers but also as publishers of thousands of (mostly subject) postcards, stereo cards[3] etc.
Margarethe Fehim Pascha Postcard by Neue Photographische Gesellschaft identified by one of the marks they used. 
NPG ‘Flag with star of David logo
[2] Leo Mendl a salesman for Neue Photographische Gesellschaft was also instrumental in early German cinema as a collaborator of Oskar Messter.
[3] Approx.Size: 7X3.5 inches (17.8X8.7 cm)
Publisher: Neue Photographische Gesellschaft Steglitz Berlin 1905 Series# - Number# 2
Caption: Turkey Istanbul CONSTANTINOPLE Burnt Column Colonne brulee.
