Diocletian, AE Antoninianus. Jupiter, Antioch, 22mm. 285 AD.

Obv. IMP CC VAL DIOCLETIANVS PF AVG, radiate, draped, cuirassed bust right.
Rev: IOVI CONSERVATORI AVGG, Jupiter standing left, presenting 
Victory on globe to emperor who is standing right holding parazonium or sceptre.
Officina letter in lower centre.
Mintmark XXI.

RIC V-2 325 Antioch, rated common

Courtesy of Numismatik Lanz, 2009. Sold for 50 Euros.
Ex Münzen & Medaillen Deutschland GmbH - Auction 19, Lot 846, 16. May 2006.