That's a very nice Krag, but believe I'd stop somewhat short of "unissued". Probably worth somewhere in the $1000-$2000 range to the right buyer. No "rare" features to bump it up, and - usually - the handguard color match of original assemblies is somewhat closer; probably an outgrowth of the sight replacement. I'm pretty sure that it was originally equipped with a Model 1901 rear sight.