Watch List notes:

SICILY. Kamarina. Circa 425-410 BC. Pentonkion (Silver, 10 mm, 0.21 g). Bust of a youthful river god facing, turned slightly to the right, with abundant hair and two small horns. Rev. Wheel with four spokes; pellet in each quarter and at the center. Buceti 32 (this coin, but with the head described as female and the attribution uncertain). Manganaro, Mikrà 30 and pl. 5, 73 (this coin). Extremely rare. With a striking head of the river god. Slightly rough surfaces, otherwise, good very fine.
From the "Collection sans Pareille" of Ancient Greek Fractions, and from the collection of A. D. Moretti, The New York Sale XI, 11 January 2006, 37.

Kamarina was located between two rivers, the Hipparis and the Oanis; it is more likely that the god on this coin is Hipparis.