Watch List notes:

L. Calpurnius Piso Frugi. 90 BC. AR Denarius (18mm, 3.81 g, 12h). Rome mint. Laureate head of Apollo right; mark of value to left; P below chin / Horseman galloping right, holding palm frond and reins; I• above. Crawford 340/1; Sydenham 671; Calpurnia 11a; RBW 1263 var. (control letters). Toned with some iridescence, a touch of porosity. Good VF.