Joseph Beuys magnetic postcard Rare Signed Ed of 500

Magnetische Postkarte, 1975. Signed in pencil 'Joseph Beuys' in lower margin. Sheet iron card, 10.5 x 14.8 cm, with impressed lettering 'Magnetischer Abfall' and magnet stamped 'hauptstrom'. Publishing information printed on rear. In original cardboard box, 16.5 x 12 x 2 cm. One of approx. 500 copies. Ref: Schellman Beuys Multiples, No. 154.