Constantine II, AE follis. Arles. AD 322-323. 

CONSTANTINVS IVN NOB C, laureate, draped and cuirassed bust right, seen from the back.
CAESARVM NOSTRORVM around VOT X within wreath.

Mintmark Q star AR. 

RIC VII Arles 256; Sear 17188.
Rare. Rated R4.

With permission of cgb.fr, Oct. 2012.