Gallienus, AE29 of Perinthus, Thrace. 21.93 g. AD 253-268. 

AVK GALLHNOC CEB, laureate, draped and cuirassed bust right.
PERINQIWN DIC NEWKORWN, Hercules cleansing the 
Augean Stables, standing right, about to strike pile of 
stones with a pick to release water; vase at foot right.

Varbanov 604; Schoenert-Geiss Perinthos 903. 
Extremely rare. 
This type was first described by Aline A. Boyce, in an
article, "A New Heracles Type from the Mint of Perinthus" 
in ANS MN 4 (1950), pp. 73-77.

With permission of cngcoins.com, Jan. 2015.