Here for sale is a very nice ancient Roman coin:

Valentinian I, 364-375AD, AE3.

I believe this to be the correct emperor and time period, but the buyer should make up their own mind based on the pictures provided. 

It is guaranteed that this item is an original Roman coin in found condition; most frequently metal detected from within the UK. Perfect as a gift or to grace a collection. Your item will be sent to you bubble-wrapped and in a firm envelope.

Please feel free to ask me any questions.