Watch List notes:

Q. Marcius Libo, Denarius, Rome, 148 BC; Ag 4,02 g; Helmeted head of Roma r.; behind, LIBO; before, X, Rv. The Dioscuri galloping r.; below, Q MARC; in ex. ROMA in partial frame.
Broad flan, beautiful.
Extremely fine
Crawford 215/1
EBC