John,
The 1898 carbine is a rare bird, and one that is often faked. I'm not the expert on SN ranges, but eventually 5MF or Hosmer will pick up on your post and weigh in. My own thought is that most of the real '98 carbines got heavily used during or after the SAW and were arsenal refurbed. When they did that they usually updated the sights and the wood.
That said, a Krag is a work of art that you can shoot, and the Krag carbine was easily the best hunting rifle ever produced by Springfield Arsenal. Real or fake, you've got something good.
jnInformation
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