Watch List notes:

C. Vibius C.f. Pansa. 90 B.C. AE as (27.1 mm, 9.48 g, 10 h). Semuncial standard. Rome mint. Laureate head of Janus, I above / ROMA / C·VIBIVS, three prows of galleys right. Crawford 342/7d; Sydenham 690b. Fine, rough. 

Ex RBW collection (not in previous sales).