Brittscr,
According to stories and what we read:
All German soldiers were "officers", and
all Japanese soldiers were "snipers".
Such monikers make for better stories.
You have a good example of a police luger, and knowing it was your Grandfather's makes it
very special- matters not from whom he acquired it- or how. JMHO
As to why no "extra" safeties; pistols issued to the German "barracked" police were not modified with additional safeties- Ed knows this as he wrote the book!
Welcome and enjoy the pistol.