Watch List notes:

Anonymous. 169-158 B.C. AE as (29.9 mm, 19.28 g, 7 h). Rome mint. Laureate and bearded head of Janus; above, I / ROMA in exergue, prow of galley right; above, star; in right field, I. Crawford 196/1; Sydenham 264. F/VF, brown patina, a bit porous. 

Ex RBW collection (not in previous sales).