Diocletian AE Antoninianus. Siscia. AD 292.

IMP C C VAL DIOCLETIANVS P F AVG, radiate, draped bust right.
VICTORIA AVGG, Diocletian and Maximianus standing facing each other, together holding together Victory on globe. 
Gamma in lower centre.
Mintmark XXI.

RIC V-ii, 277A; Cohen 477
With permission of Auktionshaus H. D. Rauch GmbH, May 2011.