Watch List notes:

Sicily, The Mamertinoi Æ 27mm. Messana, late 3rd century BC. Laureate head of Ares to left; helmet behind / Nike standing to left, holding wreath and palm branch; [MAMEP]TINΩN around. CNS 16; SNG ANS -; Särström Series VI, Group A, 117-123; HGC 2, 863 (R2). 21.62g, 27mm, 12h.

Very Fine. Extremely Rare; only three other examples on CoinArchives.

From the Italo Vecchi Collection;
Ex Bertolami Fine Arts - ACR Auctions, Auction 67, 11 July 2019, lot 113 (hammer: £300).