They were a short-lived model from S&W. The Turkish gunmakers have been making inroads into the American market for at least 6-8 years. They've been sold under labels: DeHaan, S&W, CZ, Kimber, Huglu, SKB, Cabelas Dickinson and probably a number of others.
They've targeted the entry level and slightly above portion of the doublegun market. Double guns are labor intensive to make and are relatively expensive compared to autos and pumps. The cheapest American sxs currently being offered by a manufacturer runs around $4500.
Recently, a well respected gunsmith I know, took one of the SKB Turkish sxs guns apart. He said it was well made inside.