Copper and black vintage brooch

This wonderful vintage acrylic resin brooch was made near Bergamo in Italy. The area of Bergamo has  been the centre for button manufacture since the beginning of the 20th century.   Bergamo is also the birthplace of the composer Donizetti.   The brooch has a diameter of 2.8 inches (7cms).  The centre is black, surrounded by mottled copper coloured resin.