Diocletian, Lyons, Antoninianus.

IMP DIOCLETIANVS AVG, radiate, cuirassed bust right
IOVI AVGG, Jupiter, naked, standing facing, head left
chlamys over shoulder, holding Victory on globe and
sceptre, eagle at foot left.

Mintmark: A

Ref: RIC Vb 28. 

Contributed by Ars-Aeterna / David Suter, Switzerland, October 2009