Watch List notes:

M. Aurelius Cotta, Denarius, Rome, 139 BC; AR (g 3,50; mm 17; h 4); Helmeted head of Roma r.; behind, X; before, COTA, Rv. Hercules in biga of centaurs r., holding club and reins; centaurs each carry branch; below, M AVRELI; in ex. ROMA. Crawford 229/1a; Aurelia 16; Sydenham 429.
Minor flan crack, good very fine.