M. Sergius Silus.     Denarius, 116 or 115 BC.   Obv.    Helmeted head of Roma right; behind, ROMA and barred X; on right, EX·S·C.        Rev.   Horseman galloping left, holding sword and severed head; below, Q/ M·SERGI; in exergue, SILVS.     Cr. 286/1; B.  (Sergia) 1 ; AAA 276.     3.89 g.   17.50 mm.        Lovely iridescent tone.    VF.