Crispus, AR Miliarense, 24mm, 4.04 gr, Thessalonica, 325 AD.

FL IVL CRISPVS NOB CAES, laureate, draped, cuirassed bust right.
FELICITAS ROMANORVM, Constantine I standing between Constantine
 II on the left and Crispus on the right, all in military
dress and holding sceptre, within two-columned archway. 

Mintmark THES.

RIC VII (Addenda) Thessalonica 140B (this coin). 

Extremely rare, only this example known.

Contributed by Dr. Hubert Lanz, auction November 2000, 
Added July 2011.