'rap1610' - Welcome to the KCA Forum.

Your Krag, #152416, was first assembled around December, 1898.

Most Krags, during their service, were probably rebuilt at least one time. This process led to rifles being taken apart, parts were inspected and refinished at Springfield Armory or arsenals, and re-assembled in a likely new combination of parts.

The stock 'acceptance cartouche': "J.S.A. - 1898", stands for Joseph Sumner Adams, (assistant foreman - S.A. assembly room), and rifle acceptance into service in 1898.

The '1898 dated' stock may be original to your Krag or a lucky coincidence.

The sight and hand-guard first issued with your model 1898 rifle was likely the model 1896 type. This would have normally been updated with a later type of sight.

I'm not sure which '3-notch' sight you have. (Whig posted two pictures and both show different 3-notch sights 'in the middle').

If you have the model 1898, sight with square corners on the eye-piece and a 'low base', this is not correct. (This sight was installed on rifles made from August, 1899 to March, 1900). This sight was discontinued and in most cases removed from rifles because it was obsolete.

The top part of most 1898 sights were altered by rounding the corners of the eye-piece (by grinding) and machining serrations on the left side of the leaf. These altered tops were put on new bases to become a variation of the model 1902 sight.
These 'remanufactured' 1902 sights were used to 'update' Krags during rebuilding.

Like 'Whig' said, pictures will get more accurate information. An inexpensive book, like Joe Poyer's, "The American Krag Rifle and Carbine", (at around $25), will increase your knowledge and enjoyment.