Crispus AE quarter follis. Trier. AD 326. 1.97 g.

Obv: No legend, laureate, draped, cuirassed bust left
Rev: CRISPVS CAESAR PTR in three lines, star above. 

RIC VII Trier 488. 
Rare 

With permission of Gorny & Mosch auction 142, Lot 2987, Oct. 2005.