What type of Luger do I have?

The Luger I have is a .30 caliber with a 3in. barrel. It is blued with wood checkered grips. The DWM on top of the reciever is written in very scrolling lettering. On every major piece ther is a mark of a crown with the letter N under it and the number 99 on all parts. Under the barrel there is the number 1099 with what looks like a lower case k under that. The two magazines have wood bases with a big "R" stamped on them and the word Germany. When you put the saftey on it has the word GESICHERT on the side. I have the origional leather holster with it. Can anyone tell me what type of Luger I have here and if it is rare? Thank you in advance.