Fake. Look at the lettering on the link radrick007 showed, and on there the lettering is
not solid (unlike the one in your pictures), but on the real coin each letter has an outline
and the rest is with horizontal lines. Same applies to the date on the reverse.
Furthermore, on the fake reverse the toothed border is thick lower down but towards
the top looks squeezed in and thinner. Whereas on the real coin the border
is even all the way round.
EDIT: The hair and wreath on the obverse of the fake is all there still, and is usually one of
the first areas to wear; so if the hair had worn then the lettering also would have.
The lettering is not solid on this coin either, but being worn, less of the horizontal lines survive. It would be gone entirely on a well-worn example. Of course, one normally needs high quality pics to determine whether a coin is real or fake.
I couldn't find this one in eBay, though the number of 1822 crowns is quite limited. I'm wondering why Sayan is not providing us with the links to all these great discoveries...