Crispus, AE follis, Siscia. 320 AD.

IVL CRISPVS NOB CAES, laureate, cuirassed bust left, holding 
spear and shield.
VIRTVS EXERCIT, standard inscribed VOT X between two 
seated captives.
S-F over H across fields.
Mintmark epsilon SIS star

RIC VII Siscia 123 var (H instead of HL on rev).
Rare.

Offered on ebay by highrating_lowprice for US $1,200.00, March 2012.