Original vintage heliogravure by Lehnert & Landrock. Credited in lower right with their Tunis Studio logo.. Genuine vintage heliogravure from the 1920s in excellent quality. AGE: c. 1920s PROCESS: heliogravure, unmounted DIMENSIONS: 23.8 x 17.7 cm CONDITION: overall very good – as illustrated. Lehnert & Landrock is the name of a photographic duo active in North Africa in the early 20th century, consisting of Austro-Hungarian photographer Rudolf Franz Lehnert (1878 – 1948) and Ernst Heinrich Landrock (1878–1966). Lehnert first travelled to Tunis in 1904, and in 1904 he again visited with his friend, and subsequent business partner, Ernst Heinrich Landrock. The pair established a photographic studio in Tunis and worked closely for more than 20 years. They later established studios in successively, Munich, Leipzig and Cairo, publishing the works as by "Lehnert & Landrock".