Crawford 199/2, Roman Republic, 155 BC., Rome mint, SAR-series (moneyer Sex. Atilius Serranus?), Æ As.

Roman Republic, SAR-series (moneyer Sex. Atilius Serranus?), Rome mint, ca. 155 BC.,
As (ø 30-31 mm / 22,62 g), bronze, axes irregular alignment ↑← (ca. 260°),
Obv.: laureate head of Janus, value mark I above.
Rev.: SAR / ROMA , prow of galley right; I (value mark) to right, SAR above; below, ROMA.
Crawford 245, 199/2 (citing 18 specimens in Paris) ; Babelon Atilia 3 ; Syd. 378 ; BMC 748 .

the moneyer is perhaps Sex. Atilius Serranus (Seranus), Cos. 136 BC.