I've I.D'd the reverse as the Sun-God-- "Soli Invicto Comiti" translates to "The Unconquerable Sun-God",
but have trouble with the mint marks and which Emperor this could be.
Any ideas would be greatly appreciated!
Looks like Constantine I, AE follis. 316 A.D. If I get time I will get a match, but I have to nip out now.
SS
Edited....just looked again, found a match CONSTANTINVS PF AVG, laureate, draped, cuirassed bust right / SOLI INVIC-TO COMITI, Sol standing left, chlamys spread, holding globe, right hand raised, T-F across fields, dot ATR in ex.
The Mint is Trier.