B. Sempronia AE As. 148 BC. Rome. 

Obv: Laureate head of Janus, I above. 
Rev: L SEMP above prow right (MP ligate), I to right, ROMA below.

Crawford 216/2b; Sempronia 4. 

With permission of TimeLine Auctions 
(www.timelineauctions.com), Dec, 2016