Patrice,
This seems to be my day for differing with Ron. I have in my database an apparently undated Erfurt #6776 with the grip strap mark "P.A.L.II.362." where all the letters and numbers are the same height. I'm leaning toward these being police and the "P.A." perhaps standing for Polizei Amt (Police Bureau).
Here is a link to a Dreyse marked P.A.CH.235 where the C is smaller than the other characters:
http://www.gunboards.com/luger/topic...hTerms=Dreyse. This was tentatively identified as from Chemnitz in Saxony. If this is correct, there's a good chance the L. stands for Leipzig.
I will be very interested in seeing a photo of the mark and in learning the frame serial number of this gun for my database.