Maximianus, AR Argenteus, Rome mint, second reign, struck 307-310 AD.

Obv: IMP MAXIMIANVS P F AVG, laureate head right.
Rev: VIRTVS MILITVM, Campgate with three turrets, eight layers, no door. 
Mintmark RS in exergue. 

RIC VI 192; Sear (1988) 3642 var (four turrets, different mint).
Very rare (R3).

With permission of TimeLine Originals (www.time-lines.co.uk), July, 2011