So, you should start your quest with some reading and some decisions about what you want in a gun.
WW-II Lugers basically leave you looking for one made by Mauser or Krieghoff. The prohibitive cost of Krieghoff Lugers probably will stear you toward a Masuer.
They made them from 1934 through 1942. The concealment codes were "S/42", "42", and "byf" on the toggle.
If you want to shoot your Luger, don't pay for an all matching collector grade gun. Look for one with some mismatched parts - perhaps an upper receiver from one gun and a frame from another (both Mauser made). Or one with some finish condition issues.
Costs in the $1,000 to $1,200 should be achievable for a shooter grade gun in good mechanical and shooting condition.
If you want a collectible, plan on spending about 35% more. All matching in 90% condition with a mismatch magazine is typical.
If you plan on something more expensive, start first by buying the books and studying. Take the time and go to "Luger University".
I've been reworking the FAQs, and they are a good start. Just look on this site for them.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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