Can anyone help me with a ballpark on what this thing is worth? I believe it is an 1881 grade 1. It has the straight stock and twist barrels. I have not found one just like it on guns america or gun broker. I have only seen a couple close to it, but neither of them had the straight stock. I have been researching and researching and researching

and just keep hitting dead ends. Does anyone know of a good appraiser near Houston, TX?