A small bronze coin of a type called a nummus fraction. Made in AD 317-324 in Trier, it is one of the few examples of this coin from the Seaton Down hoard. The reverse depicts the Emperor sitting on a magisterial throne and the coin was issued to mark the death of Maximian. The coin was issued by Constantine I to commemorate his adopted grandfather (and incidentally rival for power).
This object is on display at RAMM in the Making History gallery.