Nice pictures very nice gun, wrong grips they are later hard rubber ,with the black eagles, and the rear sight appears to have been "files" at an angle both front and rear ,maybe even a "made up" one to fit the early dovetail,,,which is narrower that all the following models...yours is considered the type VI variation of the red eagles, has the newer features of the bolt (recoil spring support added) and I believe it shoukd be "in the white"?? yours is blued at the back half??? Chad may have something to say or add???and the ejection port is tapered ( sculpted) both ends, and the barrel should have the 'flat' muzzle crown....your gun was made in November of 1950.....again , NIce gun find a sight and proper red eagle grips, can even just "repaint" the color from black to red................better close, than "wrong".....after all it IS a "red eagle" RST-4
Note the red eagle grips artic pictured above are the early version, escutcheon around the screws, yours are not, nor should be....and his bolt is closer to what yours should be,,,again, it can be fixed quite easy, and simply remove the bluing, can be done in a bath of navel jelly or rust remover and re-oiled.....make 'er 'proper' looking.