Constantine II. Æ 3.  320-321 AD.  Siscia mint.  18.29mm, 2.358gm.

Obv:  CONSTANTI-NVS IVN NOB C, laureate head facing right.
Rev:  CAESARVM NOSTRORVM around wreath and VOT dot X,

Mintmark Epsilon SIS star in exergue. 
Ref:  RIC VII Siscia 166. Rated R4

Contributed by Geoff Bambrook, July 2010.