Aural set, in container, by Collin of Paris, from Charriere, Collin and Gentile collection, c. 1900 Aural set 1895-1905
Burkhardt-Merian's set of ear instruments, complete, plated metal, in leather case, by Krohne and Sesemann, London, 1890-1910 Burkhardt-Merian's set of ear instruments 1890-1910