Not sure why the date would have been ground off. What are the proofs on the right? That might explain a bit, if it has Erfurt proofs (and is all matching), then that might tell us something. If it is Weimar proofs, and the Erfurt toggle matches, then the toggle is a force match by someone...
It is a sear and magazine safety police. Those two safety's were put on in 1933 and the magazine safety made inoperable in the late 1930's to almost all guns. Is yours snipped off by the trigger? Hard to tell by the pictures, it might appear to be mostly there, but 95% of the time they are inoperable.
Ed
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