Constantine I. AV Aureus, Arlea, 17mm, 4.07 g. AD 313. 

CONSTANTINVS PF AVG, laureate head right.
VIRTV-S AVGVSTI, lion standing left, head facing, club above
its back.
Mintmark SARL.

RIC VII Arles 6 var (officina); Depeyrot 1/4; Cohen 679; Sear 15774. 
Extremely rare. 
Estimate: $100.

With permission of cngcoins.com, June 2016