Silver denarius, 18mm, 3.81gm, issued 116/115 BC. Rome mint.
Obv: ROMA EX SC, Helmeted head of Roma right.
Rev: M SERGI SILVS, Horseman holding sword and severed head, Q before.
This moneyer (as Quaestor, hence the Q) was son of the Praetor of 197, M. Sergius Silus, who fought left hand after his right hand was cut off.