Marco,
The book by Gibson will give you many pages of serial numbers and dates of production.
It also has many chapters devoted in the book to markings one needs to look for in the many variations of the HK Luger made over the 10 years or so they were in production.
Your opening question is just too broad to give you a short answer...and the best thing is to buy the Gibson book.
While you wait for your book to arrive at your home, I would also suggest you take a few hours and read through all the discussion posting in this HK Luger section. Once you read and learn more, you might be able to ask more specific questions which the members with HK experience could try to answer for you.
My advice is to delay a purchase of an HK Luger for a few weeks...until you receive your book and can study more.
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