Josef Hoffmann (1870-1956). Brooch acquired by Helene Donner (née Klimt), 1907. Execution: Wiener Werkstätte, model no. G 686. Silver, partly gilt; agate, coral, lapis lazuli, malachite, turquoise, semi-precious stones. 5.1 x 5.1 cm (2 x 2 in.). Private Collection, courtesy Neue Galerie New York.
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