Balbus Naevia, AE As. Rome. 169-158 BC. 

Obv: Laureate head of Janus, I above. 
Rev: Prow right, BAL above (AL ligate), I to right, ROMA below.

Cr. 179.1; BMCRR Rome 608; Naevia 1; Sear 696. 

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