Crispus AE Follis. 324-325 AD.

Obv: FL IVL CRISPVS NOB CAES, laureate, draped, cuirassed bust
 left
Rev: PROVIDEN-TIAE CAESS, campgate, 2 turrets, 6 layers, star above, no doors; SMN delta in ex. Unlisted officina. 

RIC VII Nicomedia 91 var (only officinae B and Gamma are listed). Extremely rare - even the known officinae are rated R5.

Contributed by Dane for Roma Numismatics, June 2009