Watch List notes:

Cn. Calpurnius Piso. 189-180 BC. AR Denarius (18mm, 3.68 g, 11h). Rome mint. Helmeted head of Roma right; X (mark of value) behind / The Dioscuri, each holding spear, on horseback right. Crawford 153/1; Sydenham 348; Calpurnia 1; Type as RBW 681. VF, lightly toned, weakly struck in a few places.

From the Andrew McCabe Collection. Ex RBW Collection duplicate, purchased from Numismatica Ars Classica, 1996.