I am doing a copy of this for marsh birds. Just an engraving upgrade. A young guy by me wanted to try, and I gave him a Hollenbeck action to scratch on.
I haven't seen many SAC's with the Krupp tubes.
Note to add: I couldn't help but notice the NRA guns color is quite similar to Brad B's colored Syracuse. Probably where he got his reference images. Judging from pictures, I'd say you could patinate the refurbished SAC at Bachelder's to a very good approximation of the NRA gun.
Doesn't make it "as manufactured", but you can see where you can take the Bachelder gun with a little effort at patination.
FWIW I don't patinate guns, except by accident, neglect, or omission.
This gun should be out of restoration by now, perhaps Tom Archer has seen it after refurbishment.
http://www.cowanauctions.com/auctions/item.aspx?id=67877
