Watch List notes:

L. Calpurnius Piso Frugi. 90 BC. AR Denarius (17.5mm, 3.98 g, 5h). Rome mint. Laureate head of Apollo right; CXVII to left / Horseman galloping right, holding palm frond and reins; IIII below. Crawford 340/1; Sydenham 663c; Calpurnia 11. EF, light golden tone, some die rust and die break on obverse.

Ex Dr. Patrick Tan Collection; Classical Numismatic Group Electronic Auction 350 (6 May 2015), lot 435.