I have no clue what it is but it doesn't look real to me, looks like a copy of something... I have found copies of coins on the beach and they were deep. I've seen that whatever you have before I can't place it sorry.
Gratian (367 -383 AD) AE3. D N GRATIANVS P F AVG, diademed, draped bust right / GLORIA ROMANORVM, Gratian, with labarum, dragging captive right by the hair, TES in ex x/xB in the field. Mint of Thessalonica
Thanks Epi,i can see it now, that is a roman coin but it looks like something bought from ebay unless you spent hours or weeks cleaning it because no roman coin will come out of the ground looking that good.