The hardware looks to have come from a nice iron mounted rifle before the restock.
You guys are right about the hardware possibilities - there were quite a few Ohio rifles stocked in iron - including some that you would be hard pressed to tell from pieces made in Virginia or Tennessee. I've seen four Jerman Jordan (Ross County, Ohio) iron mounted pieces - some with greaseholes and no buttplates - and the guards are very much like the one in these photos. But I don't think he made this hardware. Lots of southern and midwestern guns got carried west and used hard too - it could have been restocked somewhere different from where it was made.
That being said, the engraving on the sideplate, although rudimentary and possibly a later addition, is really close to a rifle that Myron Carlson copied the hardware from, and Ron Borron did a drawing of. Myron called it his "Rowan County" pattern but others have indicated it to be from southwestern Virginia or Tennessee. (Wallace has shown another piece by the same hand, with a captured lid box, in a couple of his Muzzle Blasts articles.) The buttplate has a similar feel to it as well. The triggers are different but to me look very small for the guard and my guess is that they were possibly added at the time of the restock.
The shape of the long heel on the buttplate on the piece in the photos would sort of make me lean toward Southwestern Virginia or early east Tennesse, but that is not much to go on. The guard is close to the two Joseph Bogle guards I've seen, but so are many others - including Jerman Jordan
Was the spur at the back of the grip rail broken and repaired, or is there a joint there where the grip rail meets the piece that forms the rear finial? If that is a visible joint right on the front of the spur, that would be atyptical and perhaps a way of narrowing it down. What does the barrel tang look like?
Guy