JDR wrote on Nov 30^th, 2018 at 3:27pm:

FredC wrote on Nov 30th, 2018 at 3:18pm: Nice find! There was a US arsenal in California that began with a B, I wonder if that is their mark next to "MODEL". Not sure if I have ever seen that mark before. Thank you. I was unbelievably lucky to get it as I had no idea how rare they were when I bought it. I think the "BNP" is a Birmingham Proof House mark, from when it was imported. That's my best guess. Possibly brought over here in the latter half of the 20th Century?

Very possible on the Birmingham proof mark, or it might be on every Krag made, I have been known to miss the obvious.