That era of the M70's, which started production in April of 1936, had the "rudder" safety for the first several thousand rifles built.
My .30 GVT'06 (Sept. 1936) serial # under 2,000 has the rudder safety. It has 2 detent positions only, but 1/2 way between them
with no detent, still allows unloading while the safety in engaged. It swings to the left, rather than the right as in the later M70's.
Beautiful rifles.