Watch List notes:

Q. Antonius Balbus. 83-82 B.C. AR serrate denarius (3.71 g). Rome mint. S·C, laureate head of Jupiter right / Q·ANTO·BALB/PR, Victory driving quadriga right, holding wreath and palm; R below horses. Crawford 364/1d; Sydenham 742b; RSC Antonia 1. NGC graded AU 4/5, NGC certified. 

Crawford comments that this coin was an emergency issue in preparation to resist Sulla's army in his return to Rome. Sulla's victory at the Colline Gate gave him total control of Italy.