Unfortunately, the little "WRL" stamp on the reverse (clearly visible at 11 0'clock in the second pic) indicates that this coin is indeed a fake, made by Westair Reproductions Limited, a British mass-producer of replicas. You can find WRL replicas in museums and tourist traps all over Britain. My dad brought me back several on his visits to Britain, and I think I have a Caesar denarius exactly like it around here somewhere.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis