That's something very unusual.
It does not look like a fake.
The question is: Was it done during or after the minting process? If it is post mint damage, the coin is worth only its silver value.
According to the catalogs, genuine crowns weigh 28.28 grams. So what happened to one whole gram of coin?
The underweight condition argues for post mint damage. Someone scraped and scratched the obverse to look totally bizarre. They also machined around the edge of the coin to give a "bordered" appearance. Compare your coin to the close-up of a normal genuine specimen using my image.
There is the possibility you have a "struck through" error coin, made during the minting process. The fact that the reverse is almost intact, but the obverse is disfigured, means a heavy leather glover, perhaps, got into the minting machine and was smashed into the coin under high pressure during striking.
The choices are: (1) post mint damage, or (2) struck through heavy leather.
Most likely, it's (1).