Crispus AE3, Siscia.

Obv: CRISPVS NOB CAESAR, laureate, draped, cuirassed bust right.
Rev: PRINCIPIA-IVVENTVTIS, Crispus, hemleted, in military 
dress, standing right, holding reversed spear, hand on 
shield resting on ground, cloak spread on both sides.

Mintmark BSIS.

RIC VII Siscia 39, rated R4, very rare.
Found in England, 2009.

From Dane's collection, Nov. 2010.