Roman Republic, Anonymous 157-156 BC AE Semis (Bronze, 22mm, 7.02g) Rome(?) mint.
Obv: Laureate head of Saturn right; S (mark of value) to left
Rev: Prow of galley right; S (mark of value) to right, ROMA below.
Cf. Crawford 198B/2; cf. Sydenham 143a;