Ancient Forgery.

Forgery is as old as money itself: Forum Ancient Coins has a nice collection of ancient forgeries.

This one above is forgery of an Antoniniaus coin:

"However if his too is just the core of a plated ancient forgery, then it is not the early mint product that I was postulating, but just the work of an ancient forger that could easily be joining an obv. and a rev. derived from two different coins. Checking my cast of Gunner’s coin against Heather’s image, the two coins do appear to be from the same dies. Apart from stealing mint dies, counterfeiters sometimes manufactured transfer dies from official coins, which also allowed them to produce counterfeits in mint style. " - Curtis Clay

See more ancient forgeries: Link - Thanks Al!