Diocletian. AE Antoninus. Siscia. 

IMP C DIOCLETIANVS AVG, radiate, draped bust right

CONCORDIA MILITVM, Emperor standing right, holding short 
sceptre, receiving Victory from Jupiter, standing left, 
holding vertical sceptre. 

In lower centre: officina letter A. 
Mintmark XXI. 

La Venera hoard IV, 7756, La Venera (1880), 4308. RIC V-2 306 var (obv. legend). Scarce.

With permission of Roma Numismatics, Feb. 2010