Constantine I, AE follis. London.

CONSTANTINVS PF AVG, laureate, helmeted and cuirassed
bust left, holding spear and shield.
CONCO-R-D-MILIT, Concordia standing left, holding two 
standards.
Star in right field.
Mintmark PLN.

RIC VI London 197
Rated R2.

Found in Lincolnshire by Tom Redmayne, 2008, donated to the 
British Museum.