Watch List notes:

Sicily, The Mamertinoi, Onkia, c. 220-200 BC; AE (g 4,00; mm 16; h 9); Laureate head of Apollo l., dotted border, Rv. MAMERTINΩN, omphalos; dotted border. CNS I, n. 28; SNG Copenhagen 452; SNG ANS 433.
Rare, green patina with brown shades, smoothed. Good very fine / About extremely fine.