Any ideas welcome! Very difficult

All i know is that it is Roman.
Thanks in advance.

Angus

Obviously appears a crown in bust right.Very few emperors had crown in their heads in coins such as Trajan Decius ,Caracalla.In my eye looks for Gallienus 260A.D. about.

How about this one, but you probably should search for other "radiate" coins with victory on wildwinds...

Roman Imperial: Diocletian (284-305) Bi Antoninianus, Cyzicus (RIC-306)

Obv: IMP C C VAL DIOCLETIANVS AVG; Radiate, draped, cuirassed bust right, seen obliquely from behind
Rev: CONCORDIA MILITVM; Emperor standing right receiving Victory on globe from Jupiter standing left, Γ in field between them, XXI in exergue