Otto Künzli (1948 Zurich - lives in Munich), 'Rotes Loch' brooch, 2006, Silver, acrylic varnish. 24 grams. 60 x 45 x 6 mm. Signed: artist's signature, 2006 (incised)., Hufnagel, Florian (ed.): Otto Künzli. Das Buch, Stuttgart 2013, p. 457. Number 1 of 8.

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