The obverse legend on this coin ends with CONS meaning Maxentius was Consul for the first time; and this happened on 20 April 308.
Maxentius
24mm 5.3gm
IMP C MAXENTIVS P F AVG CONS, laureate bust facing left in imperial mantle, left hand holding eagle-tipped scepter.
CONSERV VRB SVAE, Roma seated facing, head left, in hexastyle temple, right hand holding globe, left scepter; shield by side; knobs as acroteria and crescent in pediment.
In ex. AQS
RIC VI Aquileia 124