Constantine I, AE follis of London. AD 312-313.

CONSTANTINVS PF AVG, laureate, cuirassed bust right.
ROMAE AETER AVGG, Roma, helmeted, seated left, holding branch in right hand and globe in left hand.

Star in left field.
Mintmark PLN.

RIC VI London 269; BMC 1977,1005.41

Image courtesy of the British Museum.