Constantinus I (AD 307/310–337).
Follis (AE, 19 mm, 3.43 g), Siscia mint, AD 320–321.
CONSTANTINVS AVG Head of Constantinus I, laureate, right / D N CONSTANTINI MAX AVG around wreath containing VOT / XX; ЄSIS✱ in exergue.
RIC 159.
Dark toning with some remains of silvering. Extremely fine.