I have a Sept. 1936 M70, serial # 1830, that has the original RUDDER safety. It is 3-positional, perfectly, however does not have the indents for 3 positions.
The rudder safety works to the left, not the right. IE: - to the left of the centre of the bolt is on safe, to the right: straight back, to fire.
Seems to me, the first 2,250 M70 rifles made, had this trigger. Not sure what they had, afterwards.