Watch List notes:

AT or TA series.
Uncia circa 169-158, Æ 5.94 g. Helmeted head of Roma r.; in l. field, pellet (?). Rev. Prow of galley r.; above, monogram TA and in r. field, pellet. Sydenham –. RBW –. Crawford –.
An apparently unique and unrecorded denomination for this issue.
Green patina and good very fine