[Ron Wood]

Having the GESICHERT marking makes an entirely different consideration necessary. That would seem to indicate that the grip safety was added to this piece after production. I have an odd "Swiss" Luger (cross in sunburst is on the forward toggle link and the chamber is blank) in 9mm that was modified this way. It has the GESICHERT marking in the upper position, but is actually on safe with the thumb safety in the upper position concealing the GESICHERT marking. The lower safety area is not polished on my Luger however. It was modified by welding in a web in the lower grip area to mount the grip safety and spring. There is no stock lug and the grip is of full contour, which would appear to indicate that a stock lug was not ground off. But possibly the area was built up with weld when the web was added.

I would suggest looking to see if this Luger has been so modified, and if you have another original grip safety Luger closely comparing the contours and thickness of the bottom of the grip adjacent to the magazine opening. Pictures of the grip frame with the grip safety removed and of the bottom of the grip showing the magazine opening would be of interest.

If it has not been modifed then I am at a loss to explain the safety marking and you have a very unusual variation indeed.