Tex, it would be helpful and great to see pictures of this luger. Many times a person has a luger and it is mismatched, or is nickled or by gum, is SIMPLY not a luger.
So, full serial number, etc on it.
There are thousands of lugers that were cleaned up and don't have a date and then was sold on the commercial market.
So, simply us assuming that it is a commercial alphabet luger is not always true
So, in my library, here in Iraq (which weighed about 40 lbs), I have 5 luger books. The best all around are Jan Still's books, and for what yours sounds like, Weimar Lugers by Jan is the book you need. At home, I have another 10-12 luger books, 5 or 6 P38 books, etc; knowledge is everything and although many folks rely on the internet, I personally like to hold and touch and look up information.
Ed