Quarter follieses of Sever's are much less common than his follises, which are also not common.
Roman Imperial
Severus II as Caesar (305-306), Quarter Follis 305-306, Siscia mint
Obverse: laureate head right
FL VAL SEVERVS NOB C
Reverse: Genius standing left, holding patera and cornucopia, SIS below
GENIO POPVLI ROMANI
Weight 2.31 g