Watch List notes:

P. SVLA. 151 B.C. AE as (29.5 mm, 19.16 g, 4 h). Rome mint. Laurete head of Janus, I above / ROMA, prow of galley right, female head adorning prow stem, P·SVLA above; I to right. Crawford 2005/2; Sydenham 387. Fine, earthen deposits. 

Ex RBW collection (not in previous sales).