Watch List notes:

Sicily. Syracuse. Dionysios I (405-367 BC.). AR Hemilitron, c. 405-395 BC. Obv. Head of bearded male (Ares?) right. Rev. Wheel with four spokes; Σ Υ in upper quarters; two dolphins in lower. HGC 2 -; Boehringer -; SNG ANS -; Buceti -. AR. 0.26 g. 10.00 mm. RRRR. Extremely rare. Apparently unlisted in the standard references. For a similar specimen see Roma Numismatics E-Sale 3 (2013), lot 105.
Darkly toned, slightly porous metal. About EF.