Watch List notes:

M. Aurelius Cotta, Accidentally incuse denarius, Rome, 139 BC; AR (g 3,75; mm 19; h 12); Helmeted head of Roma r.; behind, X; before, COTA, Rv. Incuse of obverse. Crawford 229/1a; Aurelia 16; Sydenham 429.
Minor scratch on obverse, about extremely fine.