Pic of buttplate was not up when I posted.

That looks to be the "intermediate" plate (heavy weight with curved toe) between the original flat thin plate of the first 1892s, and the common final type seen on almost all Krags today. I have one on my late 1892 (or Joe Farmer's "magazine rifle") s/n 20196.

I'll bet the inletting beneath the plate is "normal". If it isn't, we have a bit of a puzzle.