Gratian, AV solidus, Trier. 15mm, 1.73 gr, 

DN GRATIA-NVS PF AVG, pearl diademed, draped, cuirassed bust right.
VICTORIA AVGVSTORVM, Victory advancing left, holding wreath and palm.

Mintmark TROB. 
RIC IX Trier 21d. 

With permission of Numismatica Ars Classica, 2005. Sold for 3,200 Swiss Francs.