Need Help With 1819 Hf Crown

Yes, looks like a contemporary forgery to me. A fellow collector I know has a sixpence that's very similar. These forgeries are quite collectable in their own right.

Impressions were taken of legitimate coins from which copies were made in copper to the correct size an weight, these were then silver dipped to pass off as the genuine article.
I have a couple of these contemporary forgery half crowns myself (images attached), one dated 1817, the other (like yours) dated 1819, though mine looks as if it has had something of a hard life. As you can see, all the silver has worn away from the 1817 coin but the 1819 specimen still retains a little of the original coating.
The 1819 forgery is the most common, 1818 is next, 1817 is scarce, 1820 is rare and, as far as I am aware, 1816 has never appeared so may not have been copied at the time.