below is the dealer's description.
Lech already has an example-
http://www.notinric.lechstepniewski.info/6lon-134.html"CONSTANTINE I
AE Follis, ca.310-12AD, ca.22mm, ca.4.2g.
CONSTANTINVS AVG, helmeted and cuirassed bust left, no spear or shield. / ADVENTVS AVG, Constantine on horseback, riding left, right hand raised, left holding spear upwards, horse pawing seated captive to left.
| *, PLN = London
Not listed in RIC with this bust type - See Cloke & Toone 7.01.005"