Todd: the crolle Damascus pattern is clearly seen on the barrel flats.
Until the gun has been evaluated by a double gun specialist smith, it is impossible to determine the value. It would not be worth shimming the hook if the barrels are unshootable; deeply pitted or with an inadequate wall thickness.
You might contact Michael Allee - he is right off Shawnee Mission Parkway.
http://www.gunsmithingonly.com/
913-238-2743
Please let us know what he finds, and we hope he can refurbish the gun so it can be used and enjoyed with appropriate ammo.