Thank you, Rick the Librarianicon.
Anyway I am just a beginner rifle shooter.

I am reading a book "The Collectable '03" by J.C. Harrison.
According the book the M1905 Sight for a rifle SA come out of factory in 1913 should be Type 2 since from 1909. Both the elevation knob and windage knob (.575" diameter) should be both grooved from 1909 to 1914.
I checked my 1913 rifle and it has a windage knob .575" diameter but both the knobs are not grooved and look like Type 3 instead but not in the size, since in the picture the Type 3 windage knob seems of a larger diameter.

What do you think about ?
Are both sight knobs of your 1913 rifle grooved ?
Thank you.