You can try Brownell's or Numrich online. Or go to a reputable gunsmith in your area.
adjust rear sight up for distance
Aligning front and rear sites to aim
Assuming you mean a Mauser 24/47, use the sight as you would any open rifle sight. The slider on the rear sight adjusts for range- marked in meters.
Shoot rifle. Note difference between point of aim and point of impact. Elevation can be adjusted at the rear sight. Windage (left/right) may be SLIGHTLY adjusted by tapping the rear sight in the opposite direction.
The front and rear sight
graduated in yards out to 1600 yds with a 'battle' sight graduated to 300 yds
The patent date should be just in from of the bolt under the rear sight. But only if it is a bolt action!!!!
line up the target on the top of the front sight while sighting the front sight through the rear peep sight.
Take it to a gunsmith for exact measurement
The rear sight must move in the direction you want the point of impact to move. The front sight can be moved in the opposite direction.
"IF" it's on the rifle it will be on the left side of the barrel just below the rear sight. However it may not be on the rifle at all.
S-130 is a type of rear sight used on Mossberg rifles- but not the model of the rifle. Take a look on the barrel.