I have a couple, but never noticed any subtle differences between them. Probably because they are from the same production time.
1896 pictured right, 4 screw sideplate.
1896 #2 also 4 screw sideplate. I don't have a photo of the right side of the revolver. They compare identically with one another.
Very interesting distinctions, thanks for sharing them with us.
Cheers;
Lefty