As the others have mentioned, you definitely need to measure the sight distances they gave. Photos can be a bit hard to take measurements from, especially if wider angle lenses are used, but if that barrel is 20" long, then the front sight looks to be in the ball park of what it should be, so a measurement is in order. I am surprised at the heavy patina on the muzzle ... I notice that the muzzle has a heavy patina on it, so if it was cut, it was cut a very long time ago. Although its collector's value is gone if the barrel has been cut down, it still has a certain amount of appeal as a vintage 'working gun'. The wood has not been sanded, which is good (never refinish or sand the wood unless it has already been destroyed by previous sanding). It has also never been re-blued, which is also good. The appearance of an otherwise un-messed with rifle is what gives it some appeal. For the right person, who really liked a working gun that had over a century of putting meat on the table behind it, they may be willing to pay $500 to $600 for it. If it is honest and un-messed with, then the value would at least double, since it is a half octagon.
