L CALPURNIUS PISO FRUGI ROMAN REPUBLIC AR Denarius OBVERSE: Laureate head of Apollo right, number LV behind REVERSE: Horseman galloping right, holding palm L PISO FRVGI below, ROMA monogram, number LXXII above Struck at Rome 90 BC 3.75g, 18.4mm Cr340/1, Calpurnia 12 Ex Timeline Originals L CALPURNIUS PISO FRUGI ROMAN REPUBLIC AR Denarius OBVERSE: Laureate head of Apollo r., behind, point control, front, check letter REVERSE: Horseman galloping towards r., holding a palm branch, above, symbol, and below Piso Frvgi / check letter Struck at Rome 90 BC 4.0g, 18mm Cr340/1, Sydenham 670d. bb/Calpurnia 11
In your condition I don't think that it would be worth much, it's a relatively common Roman Republican coin... $25-50 or so, maybe? Not an auction house coin, more like something you'd sell in a group lot or on EBay...