By drifting the front sight
top adjust the elevation up and down, the side adjust the windage right or left. .
Typically a larger, more prominent sight, adjutable for windage (left to right) and elevation (up and down)
From what I understand, having researched this in detail today, is, you don't..... That is, the rear sight is dovetailed in to the barrel, and the front sight is screwed on . In order to sight in the rifle, you would need to use a small brass headed hammer and 'tap' the sight in order to adjust the point of aim. There are options for mounting a peep sigth, such as from Williams Gun Sight, which has the ability to adjust for elevation and windage quite easily. Alternatively, you could mount a scope. Apparently, some of the earlier models require having to drill and tap holes in the side of the receiver in order to mount the scope base.
Windage is adjusted using the knob on the right rear of the carrying handle/rear sight mount. There are two elevation adjustments. For the purpose of zeroing the weapon in, you would raise or lower the front sight post as needed. The front sight base is marked with an arrow and the word "UP" - this refers to which direction you would need to adjust it to bring the strike of the round up - it actually lowers the height of the front sight post.
Elevation will be the one that moves it up and down. Windage will be the one that moves it from side to side.
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.
If the sights are fixed, they can't be adjusted. You would either need to replace them with adjustable sights, or else use the "Kentucky windage" method of compensation.
IF IN FACTORY CONFIGURATION, The front sight is fixed and not adjustable. The rear sight is drift adjustable for windage changes - you need to loosen the set screw that holds the rear sight in place. From what I've found, it may take some doing to get that set screw loosened.
made 1972. value would have to be given by a firearms appraiser
On the bottom of the windage / elevation housing.
Change in ammo, change in weather