Constantine I AE Follis, 2.70 grams, 18.56 mm. Siscia. 320-321 AD.  

Obverse: CONSTAN-TINVS AVG, laureate head right.
Reverse: DN CONSTANTINI MAX AVG, around VOT XX within wreath.

Mintmark delta SIS sunburst.  

RIC VII Siscia 180; cf Sear 3873. Rated Scarce.

Courtesy of TimeLine Originals (www.time-lines.co.uk), Apr. 2010