I was attracted to this coin by the portrait style and bought it withough having done any research on it. It turns out to be quite rare and hold some historical interest. It is issued as he emerged from his abdication by Maximinus II Daia (see notes below). Follis Obv:– IMP C M AVR VAL MAXIMIANVS P F AVG, Laureate, draped and cuirassed bust right Rev:– GENIO IMP-ERATORIS, Genius standing left holding patera and cornucopia Minted in Antioch (_ | Theta / E //ANT Dot). Early to Later A.D. 309 Reference:– RIC VI Antioch 112c (R) (Citing Oxford) 6.39 gms. 26.19 mm. 0 degrees. Better than the RIC plate coin (reverse only illustrated). From RIC Notes "A very remarkable innovation, peculiar to this issue, is the reappearance of Herculius (with the long legend Imp C M Aur Val Maximianus P F Aug matching those of Galerius and Licinus, and with cuirassed bust) on rare coins with Genio Imperatoris; this is parallelled at the same time (see RIC VI page 656). Expelled from Italy c. April 308, and rejected at the Carnuntum conference in November 308, Herculius had received ample share in the coinage of Constantine's mints, and it seems that Maximinus (now antagonisitc to both Galerius and Licinius) may have been momentarily willing to demontsrate his hostility by including the name of the man who might still play and anti-Galerian part in the west."
