Constantine I AE Follis, Cyzicus. AD 306-337.

IMP CONSTANTINVS AVG, Laureate bust left, wearing trabea, holding mappa, globe and sceptre.
IOVI CONSERVATORI AVGG, Jupiter standing left, naked but 
for chlamys over shoulder, holding Victory and sceptre.

Wreath in left field
Gamma in right field.

Mintmark SMK.

RIC VII 8.