Watch List notes:

Italian States, Mantua. Guglielmo. 1550-1587. AE quattrino (15.8 mm, .92 g, 3 h). Gonzaga family issue. GVLI · DVX · MAN · III · (S?) · M · M · F, bare head of Guglielmo III left / SANCVIND · P · F · HIE[...], fountain (?) atop short round column. MIR 528; Biaggi 66. Fine, rough, dark gray patina .