Galerius AE Follis. 

Obv: GAL dot MAXIMIANVS PF AVG, laureate head right 
Rev: GENIO A-VGVSTI, Genius standing left, modius on head, naked except for 
 chlamys over left shoulder, holding patera and cornucopiae; left field: 
 star; right field: S; 

Mintmark: dot SM dot TS dot. 

RIC VI Thessalonica 40a, rated Common