Constantius I Chlorus silveredAE follis, Serdica, AD 305-306.
IMP C FL VAL CONSTANTIVS PF AVG, laureate head right.
GENIO POPV-L-I ROMANI, Genius standing left, modius on 
head, naked but for chlamys over left shoulder, holding 
patera and cornucopiae.

B in right field.
Mintmark SM dot SD dot.

RIC VI Serdica 12a; Sear 14179.

Particularly high grade for the type with original silvering still present.