Watch List notes:

Anonymous. 189-180 B.C. AE as (36.4 mm, 34.02 g, 1 h). Rome mint. Laureate head of Janus, I above / ROMA, prow of galley right; bull and MD monogram above; I to right. Crawford 142/1; Sydenham 299. Fine, olive green patina. Rare. 

Ex RBW collection (not in previous sales). 

The meaning of the MD monogram is uncertain but may represent the moneyer’s initials, M. Durmius is one possibility.