Gallienus, AV multiple aureus medallion, struck AD 261. 51.37 g.

IMP GALLIENVS PIVS FELIX AVG, half-length, laureate, draped and cuirassed bust right, holding inverted spear in right hand and shield in left hand.
VICT GAL AVG III, Victory, holding goad and reins, palm branch over shoulder, driving galloping biga left, 

Breccia, Alexandrie 26 (this coin); Delbrueck Pl. 15,51 {this coin). Unique. Gold version of Gnecchi II, 32 and Cohen 1038 (both AE)

Bank Leu auction 65, lot 461, May 1996. ex Christie’s auction, Oct. 1984, lot 129. 

Estimate 100,000 Swiss France.