ROMAC: More info will be helpful. There's a big difference between sleeving and relining, with the former being more common; a relined damascus gun will still have it's original barrels and their typical damascus pattern will be discernable (unless someone blued them to make them look like fluid steel), while a sleeved gun will have fluid steel tubes and the first few inches at the breech end, although still the original damascus steel, will have been blued to match the rest of the barrels.
Too many other factors will affect the value of a gun to know if that's a good deal, but an argument can be made that a good sleeving job certainly increases the value of a gun with worn-out barrels, and that some shooters will prefer new barrels over old ones, even in good shape, because they can shoot more types of ammo (steel, higher pressures, etc.), at least if the rest of the gun can handle it.
You should also be aware that whoever paid for the sleeving probably spent more than $1,200 for that work alone. One more factor to consider is that sleeving jobs vary ... a good job is nearly invisible and the new tubes are the proper weight, but some sleeving jobs throw off the balance of the gun and make it barrel-heavy. TT
