Watch List notes:

Q. Cassius Longinus, Accidentally incuse denarius, Rome, 55 BC; AR (g 3,82; mm 19; h 12); Head of Genius Populi Romani r., with sceptre over shoulder, Rv. Incuse of obverse. Crawford 428/3; Cassia 7; Sydenham 916.
Lightly toned, about fdc.