This photograph of Carl Heinrich Theodor Knorr was taken by the photographer Fr. Berrer around 1860.
Friedrich Berrer, Heilbronn (* 1839) ( <a rel="nofollow" class="external text" href="http://www.stadtarchiv-heilbronn.de/stadtgeschichte/stichworte/f/fotografie/">1</a>)
Knorr Archive, Heilbronn, Germany