Roman Coins, Postumus (260-269) AR denarius, Cologne, jugate and laureate busts of emperor and Hercules right, rev. Hercules standing left strangling Nemean lion, 2.48g. (RIC V 349 [citing Cohen]; Cohen 123 [there listed as unique]; Elmer 521 [citing British Museum example]), fair, pierced, struck from aureus dies
This type only seems to exist in silver in two other specimens: the piece in the Dupré collection listed in Cohen, and a piece in the British Museum cited by Oman in NC 16 (1916), p. 52 and pl. III, 18. This example is therefore the third known. RIC gives the coin's rarity as R4, and there are none on CoinArchives.
Postumus was devoted to Hercules, even going so far as to depict himself as the god on some of his issues. This extremely rare coin is part of a series portraying the Twelve Labours, each with a different title referring to the location in which the Labour shown took place. In this example, Hercules is referred to as "the Nemean" for his first Labour, the slaying of the Nemean Lion.