Several words of both warning and encouragement. The gun is 110 years old. If the barrels are unusable the gun have no value. Please review this document
Proper evaluation of any vintage barrel (steel or damascus) requires 1. a bore gauge 2. direct visualization of the bore, at least from the breech to 12-18", which mean some kind of bore scope 3. careful measurement of the wall thickness, esp. the end of the chambers, at the forcing cones, and every inch out to 18". All this done by someone with the interest and expertise to do so.
Please also review the FAQ section on the Home Page; esp. the General Information and Restoration and Maintenance documents. The gun has obviously been neglected, and the innards may look worse than the outside. The stock needs to be pulled and the head of the stock examined.
While disassembled, you can get to work cleaning up the external surfaces and the wood. Taking Smith guns apart is not hard, it is the getting them back together that is very difficult, and I would suggest a double gun specialist help you. See http://www.picturetrail.com/sfx/album/view/15525639
Please be aware that any attempt at "restoration" to a like new condition will cost more than the value of the gun. But hopefully it can be refurbished to using condition.
Let us know if you have specific questions after looking over the FAQs. Take your time and enjoy the adventure