Trajan, posthumous contorniate. AE40, 25.37 g. Rome.

DIVO NERVAE TRAIANO, laureate, draped and cuirassed bust 
right (but not resembling Trajan)
Odd depiction of Hercules standing left, grasping the 
horn and jaws of a bull sitting upright on its rump.

Cohen 225; Sabatier, plate XIII, 4;Alföldi, Die Kontorniat-Medaillons I (1976), 374.

Very rare. 
Estimate: 5900 Euro.

With permission of ArtCoins Roma, Dec. 2012.