Watch List notes:

M. Sergius Silus, 116-115 BC. Denarius (Silver, 19 mm, 3.89 g, 9 h), Rome. EX · S · C / ROMA Helmeted head of Roma to right; behind, denomination mark. Rev. Q / M · SERGI / SILVS Cavalryman riding to left, holding sword and severed head of a barbarian warrior in right hand. Babelon (Sergia) 1. Crawford 286/1. Sydenham 534. Attractively toned and well centered. Very fine.
From an old collection in Geneva.