This is just one of several Roman finds at Wickhamford. The picture shows both sides of the coin which is from the time of Arcadius (383 to 408 AD). The inscriptions say 'D.N. ARCADIVS P. F. AVG' and 'GLORIA ROMANORVM'.
The article Roman Wickhamford gives an overview and describes other finds in the area.
See also Roman Badsey.
With thanks to Peter Stewart.