The cut away gun is an odd duck. A couple of other things that I notice:
#1 no rifling in the barrel?
#2 The window in the boltsleeve is not regular in shape and has no chamfer on the edges.
#3 The magazine cut off seems to show some wear.
#4 Cut out to show the trigger sear shows large radiused edges, very professionally done.
#5 Window in the side cover has nice chamfered edges on the flats and radiused corners hard to do but not impossible without CNC.
#6 Edges of the loading gate and side plate are crisp and do not show excessive "bubba" polishing.
#7 No dings in anything, I have read about "stacking arms" and think that is where a lot of the dings come from that you see on any used Krag.
The thing looks too nice to be a demo model and not finished to be a presentation piece to say a SA official, governor or some other mucky muck.
I forgot about "pack annealing", that could have been done back in the day. It would have minimized the scale build up, then allowed light polishing to be done before the bluing. Open air annealing would have made a deep scale that would have necessitated a deep buffing that left surfaces not flat.
Today you could mill those windows with carbide cutters and have a nice finish on case hardened parts, but carbide was not even a gleam in a machinists eyes back then.