Constantine I, AE follis, London. 315-316 AD.

CONSTANTINVS P AVG, laureate, cuirassed bust right.
GENIO-POP ROM, Genius standing left, modius on head,
loins draped, holding patera and cornucopiae.

S-F across fields.
Mintmark MLN. 
RIC VII London 39.
Extremely rare, rated R5

With permission of ArtCoins Roma, Auction 6, Dec. 2012.