I believe the two leaf folding sight was created to be used in conjunction with a Lyman SA tang sight. So that it wouldn’t interfere with the sight line of the tang sight. But, if there is a standard sporting rear sight on a Savage Model 1899, would that interfere with the sight plane when using the tang sight and/or would this be historically accurate?

Also, is the only tang sight in use on the Savage 1899 the Lyman SA or were there other options?