Watch List notes:

Gaul, Massalia. Civic issue. ca. 150-125 B.C. AR drachm or tetrobol (18.2 mm, 2.72 g, 6 h). Draped bust of Artemis right, wearing stephane, bow and quiver over shoulder / MAΣΣA / Λ // II A, ethnic above lion left, raising right paw and roaring; monograms between legs and in exergue;. Cf. Depeyrot 44/6-12; Cf. Dewing 23; SNG.Cop.775-80. Good Fine, full-size flan, somewhat off-center, nice light toning.

From the D. Thomas Collection.

it is possible this is a contemporary copy as they abound for this issue - or it may be a somewhat crude official piece made on an off-day. Wear and off-centeredness make the determination difficult. The weight is correct or even a bit high.