Watch List notes:

L. Sentius C.f., Rome Mint, 101 BC.
Helmeted head of Roma right, behind ARG_PVB
Jupiter holding thunderbolt and sceptre, driving galloping quadriga to right, beneath control mark B, in exergue L_SENTI_C_F.
Crawford 325/1b. Oval flan. Fine. Size: D: 22.7mm; 3.71g