PIER PAOLO CALZOLARI (BOLOGNA 1943) 'Untitled (Studio)' late 1980s - early 1990s salt and lead on board 66x29x3.5 cm Signed on the reverse Provenance Private collection, Bologna This work is accompanied by certificate of authenticity issued by the Fondazione Calzolari, Fossombrone, with No. A-CAL-0-121