This awesome coin just sold for 5,750 euros.
auction listing--
MAXENTIUS (307-312). Follis. Ostia.
Obv: IMP C MAXENTIVS P F AVG.
Laureate head right.
Rev: FEL PROCES CONS III AVG N / M OST Q.
Emperor standing left in quadriga of elephants; to left, crowning victory flying right.
RIC -, but cf. 215 (Rome mint; for type).
Extremely rare reverse type and unlisted for Ostia
Condition: Very fine.
Weight: 6.09 g.
Diameter: 25 mm.