Septimius Severus (193-211) SEVERVS AVG [PART MAX?] laureate head right / [VICT AETERN?] Victory hovering left holding garland above shield set on base. Struck 200, RIC 170; RSC 670.
There are a couple of different legends found with this reverse type, I believe Vict Aetern is the most likely.
Mark

Weight: 3.28 g
Diameter: 19 mm