Hello Mo and welcome to the forum. I doubt very much if your Luger is one of those Jes is looking for but we will need a good bit more information and some good photos to tell you much about it. If you can start a new thread in the New Collectors forum with photos, I'm sure you will learn much more about your Luger. Meanwhile, stay warm!
P.S. What you describe as a "tilda" sounds like the letter suffix "r." If you look under the "Techinical Information" link in the
http://www.lugerforum.com/ home page, you will find examples of suffixes to compare yours with.