Watch List notes:

(x) Roman Republic, C. Piso Frugi (67 BC), AR Denarius, 3.80g, 4h, Rome, head of Apollo right, snake entwined around caduceus behind, rev. horseman galloping right, holding whip, V above, C. PISO L.F. FRV[G] below (C A Hersch [NC, 1976], pp. 28, no. 16 (dies O-5/R-1012 ~ three listed); Sydenham 865f; RRC 408/1a; RSC Calpurnia 24), some flatness on hair and light scratch in bright fields, otherwise about extremely fine, rare.
Provenance
The Peter Stagnetto Collection of Ancient Coins
Spink Numismatic Circular, December 2000, RM0007 - £170
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NGC AU ~ 'Scratches' (#5880397-011). Strike 3/5. Surface 2/5.
, https://www.ngccoin.com/certlookup/5880397-011/NGCAncients/
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In Hersch's groundbreaking 1976 study on this coinage, only three examples of this die pairing were traced, two in Vienna (Kunsthistorisches Museum) and one in Turin (Castello Carignano).
Estimate: £150 - £250