You probably haven't heard of them, because they went bankrupt years ago, and Mr. Wilkinson has since died.
IMHO, a mediocre weapon that never caught on with the buying public, as evidenced by bankruptcy.
Since it's no longer in production and the company is long since out of business, it's safe to say you can forget about a warranty.
There are MANY weapons out there today that are clearly superior to the Wilkinson, so I'd recommend something else. If you can't afford a new weapon, buy a good used one.