1920 Police unit mark

[Herb]

I wish it was really as nice as it looks, well I guess it is, but it's been refinished and has a mismatched part, so it's just a shooter with an interesting gripstrap unit mark to research. I find that half the fun of getting a new Luger is taking it apart and looking for new stampings and then researching them. My first Luger, a 1937 S/42 that I got back in about 84 has a mark on the left side of the frame that I still have no idea what it is. Two verticlal 1/4 inch lines and two dots one at the left of the top of the left line and one at the top of the second line. I'll probably never find out what those are.