Watch List notes:

Celtic, Eastern Europe. Likely of Danubian Celtic origin. mid-late 1st century B.C. AR denarius (17.7 mm, 3.27 g, 2 h). Contemporary copy of Roman Republican denarius. unofficial mint, struck ca. 67 B.C. and later probable prototype: C. Calpurnius Piso L.f. Frugi. Head of Apollo (?) left / anepigraphic, horse or hound running right // A in exergue. Cf. RRC 408/1 (prototype). VF, crude, but fully struck with iridescent rainbow toning..

From the RBW Collection.