Watch List notes:

Q. Marius Libo. 148 BC. AE as (30.78 mm, 21.27 g, 7 h). Rome mint. Laureate head of Janus; I above / Q. MARC above, LIBO before, ROMA below, prow of galley right. Crawford 215/2a; Sydenham 396c. Fine. Scarce. 

Ex RBW Collection (not in previous sales).