Galerius Maximian, AE Follis, 309 AD, Antioch.

IMP C GAL VAL MAXIMIANVS PF AVG, laureate head right.
GENIO IMP-ERATORIS, Genius standing left, modius on head, 
naked except for chlamys over left shoulder  (falls low), 
holding patera and cornucopiae
Right field: O over B
Mintmark: ANT dot

RIC VI Antioch 112a, rated C2

Contributed by Russell Stanley, April 2011.

For information:
Known officina marks in right field:
o over A
o over B
o over gamma
o over delta
o over epsilon
o over sigma
o over Z
o over H
o over delta-epsilon
o over I