The factory letter just came in, now what?
Now you need to find a qualified shop that can restore this for you. I think it would be better to find a place that will remove the nickel in a plating reversal process rather than just buff it away. After you are down to bare metal, you need to have a qualified refinisher recut the stampings wherever they are weak, then give a sensitive polish to the gun before giving it its new blue.
I think a couple of unnecvessary words remained in the letter when the historian edited a standard phrase to reflect your particular revolver. Where it says "checkered walnut Magna grips with grip" I think the words "with grip" should be deleted. Earlier RMs with non-Magna stocks sometimes came with a custom grip adapter to widen the total grip and give extra support to the middle finger. But Magna stocks are incompatible with that adapter unless someone undertakes to thin the magnas (not advised) or creates some custom shims. I don't think the company did that, though home woodworkers and custom gunsmiths did.
The front sight on the gun now is not a Sheard gold bead sight and would need to be replaced if you wanted to be consistent with the gun's original configuration. Similarly, the rear sight leaf does not look like a King 111, which had a U-shaped notch and a white outline. That photo is out of focus, but I don't see the white outline and it looks like the notch is square rather than rounded. It shouldn't be impossible to find a King 111 leaf.
As SP said above, you will need to get some prewar N-frame stocks for this gun.
This sounds like a lot of work, but the good news is that the gun does not seem to have been aggressively polished before its nickel experience. Frame edges are not rounded and the sideplate still mates well with the frame. That's good.
Talk to David Chicoine's shop first (
oldwestgunsmith.com). If they can't help you, there is a firm called Ford's that has had a good reputation in the past, though I have heard opinions that their recent work was not as consistently good as in prior years. Nevertheless, those are the two places I would start.
It is my belief that 4.5 inch barrels are not common on RMs. That makes this one distinctive and interesting.