Watch List notes:

Sicily, the Mamertinoi Æ 19mm. Messana, 3rd century BC. AΔPANOY, bearded head of Adranos to left, wearing Corinthian helmet / MAMEPTIN[ΩN], hound standing to right, Φ above. SNG ANS 418; CNS I, 20; HGC 2, 880. 4.09g, 19mm, 3h.

Good Very Fine. Very Rare.

From a private North American collection;
Ex collection of a Scientist, Roma Numismatics Ltd., E-Sale 53, 7 February 2019, lot 113 (hammer: 300 GBP).