Lot Essay
Two similar enamels of the Emperor were in the Electoral Brandenburgian Kunstkammer in Berlin, now in the Gemäldegalerie, Berlin (see I. Geismeier/B. Burock, Miniaturen 16.-19. Jahrhundert, Berlin, 1986, p. 67, no. M.271 and p. 72, no. M.560, both illustrated in H. Bock et al., Gemäldegalerie Berlin: Gesamtverzeichnis, Berlin, 1996, p. 197, no. 376 and 378).