here's a decent dated Maxentius
Maxentius
A.D. 308- 309
26mm 6.2g
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; knobs as acroteria, pediment empty.
In ex. ST
RIC VI Ticinum 103