Elevation-wise, some of the 1902 sights, including those converted from 98 or 03 sights, have finer adjustments that the 25yd increments shown.  Some too fine to feel, so I have to keep my glasses handy if I want to make elevation adjustments.  The sights I'm using now are 98 bases with adjustment notches that are half the value shown above.  There is one with crosshatching on the side that would make for approx .75" difference on POI at 200yds with each "notch", but those are the ones you can hardly feel the "notches" on when moving the sight.