Nice pictures, Bob.

A couple of observations:

Your stock was likely inspected and refurbished at Springfield Armory. The clear Script "P" proof is your stock's 'second one'. There is also the faint presence of an earlier Script "P".
The same is true of the inspection or stocker's initials behind the trigger-guard. (Showing clear initials and earlier faint ones).

I can't tell for sure (I would have to see the spring type), but, I think your rear-sight is on a model 1902 base.

Your model 1898 'three-notch' eye-piece is on a leaf that has side serrations.

A model 1898 leaf should be smooth, without serrations.
Springfield Armory would not have put this sight combination together.