Watch List notes:

L. Calpurnius Piso Frugi. 90 BC. Æ As (26mm, 8.70 g, 5h). Rome mint. Laureate head of bearded Janus; I (mark of value) above / Prow of galley right, on which stands Victory right, holding palm frond. Crawford 340/4; Sydenham 677; RBW 1270. Rough brown surfaces. Fine.