[Fordzilla]

Mike, The 1859, 1863 & 1865 New models are in actuality all one model. The differences being merely barrel markings, a cleanout screw in the breechblock & minor sight change. The serial numbers do overlap but generally Cactus Bob has it close enough. Your barrel should not be smoothbore unless it's a shotgun which then would not have a rear sight & would have a bead front sight. It may either be leaded up so bad you can't see the grooves or some one shot jacketed bullets down it taking out the grooves. The lack of patchbox leads me to believe it was arsenaly converted to 50-70 at which time they changed the stock. The majority of barrels were also lines at this time & that's why I asked about the number of grooves. Not all were done & original barrel grooves will bring a premium. Does the hammer fall on to a nipple? If yes it's percussion. If it falls onto a firing pin mechanism, it's been converted to cartridge (50-70). I've owned dozens of them & the world renowned authority (Frank Sellers) is a friend of mine. Frank has written the books on the subject. I also have written books on antique firearms. "Guns That Talk" was my last one done back in 2000. If your carbine is a 50-70 & the barrel is not ruined, & in the condition you say, I would estimate it would bring $2000- $2500. (pics would help)
If the barrel is ruined, then it would be worth less.
Regards,