Think your correct paddy. I have one very similiar of Constantine I
Details as follows for mine
Roman Follis
Constantine I as Augustus
Reigned 307 - 337 AD
struck c.Mid-310 AD
Londinium mint ( London)
Obverse
IMP CONSTANTINVS P F AVG
Laureate, cuirassed bust right
Reverse
SOLI INVIC_TO COMITI
Sol, radiate, standing facing, head left, chlamys across left shoulder, right hand raised, globe in left
T | F across fields
PLN in exergue