Model 1898 Krag rifles in the 480K range were being manufactured during the 1903 calendar year.

It is likely the first rear-sight on your Krag was the 1902 rifle sight.

The experimental .30-03 caliber Springfield rifles and the Ramrod Bayonet, model 1903 Springfield rifles, had a rear-sight leaf and slide that was very similar to the Krag 1902 sight.

The Krag continued to be used by most of the U.S. Army, Navy and Marines, at least, until 1908-09.

There is some reason to believe, that before 1905, the preferred Krag sight for regular U.S. Troops was the model 1902, since that sight was similar, to the one on the New Rifle.

However, in 1905, the 1903 Springfield was significantly changed, with a new model 1905 rear-sight and an 18" knife bayonet.


The new Springfield sight had a lot in common with the Krag model 1901 sight. This may have resulted in Krag rifles with the 1901 sight being preferred for the Army and 1902 sights being relegated to the National Guard.

It is conceivable to me that there could have been some sight and hand-guard switching in this era.
There seem to be a lot of Krags with model 1902 sights that were arsenal rebuilt using the surplus knobs and leafs originally intended for the Rod-bayonet 1903 Springfield.

So much of the 'literature' on Krag maintainance and rebuilding (1903 - 1918) seems  based on conjecture. Maybe some of this is documented in Joe Farmers work?