Watch List notes:

Anonymous. 189-180 B.C. AE triens (23.3 mm, 12.46 g, 4 h). Rome mint. Helmeted head of Minerva right, four pellets above / ROMA, prow of galley right; bull and MD monogram above; four pellets to right. Crawford 142/3; Sydenham 299b. Fine, rough. Rare. 

Ex D. Thomas Collection. 

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