Koch advertising brand "Schwarzafrika", produced by "Sigmund Spear, Kunstanstalt Nürnberg."
The naive depiction of a group of 3 black African children with a harmonica playing elephant does not degrade. The provided text "KOCH HARMONICAS please every human heart" points to the global claim of the export-oriented Trossinger company Koch.
Further information (in German) about the advertising stamps can be found on the page Marketing en miniature.