L. Calpurnius Piso RSC 11a

This is one of the most common types of Republican denarii,
            struck about 90 BC by L. Calpurnius Piso Frugi. There are
            many varieties [see the discussion in Sydenham p. 101]. This
            is a variant of Syd. 660. Obv. Head of Apollo right, bunch of
            grapes with leaf behind, X before; Reverse: Naked horseman
            riding right; L. PISO FRVG/XCVIIII in ex.