The value depends a lot on the mechanical condition of the gun. If someone made the effort and expense to put Briley chokes in the gun, they may have used the gun for sporting purposes (eg trap or skeet). As such, the gun may look OK but have a lot of rounds through it. What is the orientation of the top lever? If the gun tight on face? Is there grease or oil on the trunnions? What is the LOP? Without these answers 700$ to 1400$.