Constantine I (307-337).     AE Follis, Siscia mint, 313-315.   Obv.    IMP CONSTANTINVS PF AVG. Laureate and cuirassed bust right.        Rev.   IOVI CONSERVATORI AVGG NN. Jupiter standing left, leaning on sceptre, holding Victory on globe; eagle with wreath to left; in field, to right, B. In exergue, SIS.     RIC VII 3.     3.36 g.   23.5 mm.      RR.  Very rare, with dark patina.