Watch List notes:

C. Vibius C.f. Pansa. 90 B.C. AE as (27.2 mm, 6.37 g, 5 h). Rome mint. Laureate head of Janus, I above / C · VIBIV·RS in exergue, three prows of galleys right. Crawford 342/7f; Sydenham 690e. Fine, sandy patina, casting sprue. 

Ex RBW collection (not in previous sales).