Hi, just research the minting process and protocol for striking coins and you can learn alot about mint errors.
It's called a "Magician's Coin". From your image, I can see the seam on the '78 side between the field and the rim. It's not the best job. I can clearly see where too much of the rim was removed near the date. If it is performed properly, you would really need a microscope to detect the seam. Chris
Youd think a magician (for most tricks) would want the same date on both sides. Im not into magic so I dont know.
Looks like it was fairly well done,But yes a fake. Indicators are 1 different years,2 bottom of the date cut off,3 sadly it's a double headed coin. Almost impossible to happen. Yet there are a very few examples of an actual double headed/double tailed coin.