Medallion. A Giveaway Probably But What Is It ?

It might even be a movie prop item. It doesn't promote anything, so that would be my best guess.

It resembles the obverse and diameter of a gold noble.
The noble was first issued by Edward III and continued to Edward IV.

The inscription reads in medieval letters:

H ENRI C DI GRA REXANGL FRANC DNS HYB

This translates more or less to:

Henry by grace of God King of England and France and Lord of Ireland.

So this is intended to imitate the Noble of Henry (IV, V or VI).

Medieval letters are hard to read as many of them are similar