L. Piso Frugi.
Obverse:
Laureate head of Apollo right, trident behind, B below chin.
Reverse:
Horseman galloping right, long palm over shoulder. L PISO FRVGI, R below.
Mint City: Rome. Minted 90 BC
Reference: Cr. 340/1. Calpurnia 11.
Not a common combination of mint symbols: caduceus and trident.