According to Noll P.L. signifies: Landwehr-Pionier-Bataillon. This would be a World War I unit marking. However, a 16th Landwehr-Pionier-Bataillon is not listed in Nolls book or Rumeshalle.
Is your Red 9 a police rework? Does it have fixed sights and a shortened barrel? It may be a police marking. However, I cannot find an exact match. PL (without the period) signifies: Police School for Physical Fitness. See page 195-197 of Weimar Lugers for more details on Weimar Police markings. As I recall, "P.L." may have been identified previously somewhere on this site. It may be worth a look through the postings to find it.
For the data base, what is the serial number of your Red 9?
The gun shows no sign of weimar rework. (barrel is 14cm, no 1920-stamp, adjustable rear sight.) But I know the gun came to Norway during WW2 with german troops, but do not know what kind of troops. The serialnumber is 73155.
Here is a picture of my 3 "Red 9"'s:
(The gun in question is the one at the bottom).
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