This was sold by Unique as the "Combo" -- imported and sold in the US by Firearms International Corp of Washington, DC. There should be an "FI" logo on the bottom of the forestock.
These seem to be pretty collectable. Last one I saw sold, about a year ago, went for about $700, as I recall. Check to see if the stock and pistol match -- Unique also sold the pistols separately, and I've seen the stocks for sale by themselves.