The tip and fill work are definitely not up to snuff. The lug bevel is not widely known, but remember, this arm was meant to use the long M1903 bayonet, NOT that of the Krag, which has a different latch hook actuation. The bevel makes attachment of the correct bayonet easier, and is one of the little points to check for - though not all legit specimens have it.

The most desirable cartouche for a school gun is the small-boxed JFC, not the normal Krag "JSA/date" style.

That all said, they were secondary pieces, not all done at SA, but all done at a time period when ANY stock date would have been available. The 98/99 date overstrike is interesting but I believe it is only on the SG by accident or coincidence.

That appears to be an 1898C base with a 1902 leaf, since the rails are so low.

I second Chuck's (BR's) opinion that this piece has some "issues" and is likely not a proper collector-grade piece. Sorry.