A hello and a few questions

[Joe Mc]

Hi all, my name is Joe and I am a collector of all things military and German.

I have recently purchased a 1936 fully matching S/42 Mauser made Luger P08 for a ver reasonable price.

It has all the early W/A exeptance and proof marks, its when I opend it is when it got confusing for me!

Inside by the extractor notch part of the reciever (Just below the marking for the barrel to mach the reciever) this:

W
D M

Could you please tell me what this is?

There are a few other stampings I can' identify inside. There is r.r and R.R a cross like + and quite a few number 4 stampings. They are not on parts that would be serial stamped as all of these are accounted for and are marked 27.

A couple of places have a squiggle which resembles a cross between a snake and a U. One end being fatter than the other end of the "U".

I cannot currently take photograps as I have lent my camera to a friend who is on holiday with it.

Thanks for the help,

Joe