Antoninianus - Postumus Hercules, Eleventh Labour

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This coin shares an obverse die with the following aurei: (RIC V.4 352/1, 361/1, and 366/1)

It seems as if Postumus had issued a series with multiple of the labours of Hercules. 

Because he had been assisted in completing some of his earlier tasks, Hercules was compelled to undergo two more labors. The first of these, labor eleven, was to steal the Golden Apples of the Hesperides, nymphs who lived in a grove at the far western edge of the world. Hercules tricked the Titan Atlas, whose task it was to hold up the heavens, to retrieve the apples in return for holding up the heavens while he did so. Having accomplished the task, Atlas was reticent to give up his freedom, and told Hercules that he would take back the apples to Mycenae. Once again, Hercules tricked the Titan, requesting that Atlas hold the heavens, while Hercules adjusted his cloak to be more comfortable.

- CNG