Hello Don,
The red nine Luger Artilleries appeared starting from the December 1917. According to a Kriegsministerium directive, all Arty Lugers and Mauser C96 should be marked with a red nine on the grips to avoid mistakes with ammunition. In fact in that period were available both the Mauser C96 in 9mm and in 7,63mm. The Kriegsministerium directive mentioned only the Mauser C96 pistol but it was applied also to the Luger Arty.
If you had my book, you can find a few pictures of red nine Arty at page 58.
I hope this helps.
Ciao
Mauro
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