Watch List notes:

Sicily, The Mamertinoi, Tetras (?), Messana, c. 220-200 BC; AE (g 6,34; mm 19; h 6); Laureate head of Zeus r.; at r., ΔIOΣ. Dotted border, Rv. MAMEPTINΩN, Hemers standing l., wearing chlamys and petasos, holding caduceos. CNS I, n. 36; SNG Copenhagen 457; SNG ANS 437.
Very rare, green patina, extremely fine / About extremely fine.