Roman Republic AR denarius serratus(18.3 mm, 3.91 g, 4 h). Ti. Claudius Ti.f. Ap.n. Nero, moneyer. 79 B.C. Rome mint. Diademed and draped bust of Diana right, with quiver and bow over her shoulder / TI·CLAVD·TI·F / AP·N, Victory driving galloping biga right, holding wreath, reins, and palm frond; CXXVIIII below. Crawford 383/1; Sydenham 770; RSC Claudia 5; Russo RBW 1411.
This type was one of the large issues minted to finance the extensive military operations under the dictatorship of Lucius Cornelius Sulla.
Note that if you look very closely at the rear half of the horse on the reverse you may notice some irregularity in the flan. This is an al marco weight adjustment mark referred to by many collectors(myself included) as a "Stannard Scoop" as these marks were first closely studied by Clive Stannard and discussed in his paper The Adjustment al marco of the Weight of Roman Republican Denarii Blanks by Gouging. Read the paper to learn why the mint workers gouged many denarii of this period(and please contact me if the link is broken and you can't read it).