Constantine, AE follis, London. AD 318. 20mm. 

CONSTANTINVS AVG, laureate, cuirassed bust right.
SOLI INVIC-TO COMITI, Sol standing left, chlamys across 
left shoulder, holding globe and raising right hand.
Crescent in left field.
Mintmark PLN.

Toone 189; Bourton-on-the-Water hoard 1463; RIC VII London 141 var (bust type)
Very rare. 

Contributed by "Hooverman" of the Forum Ancient Coins. Sept. 2018.