Question on German Military Lugers

I am trying to find a military German Luger, preferably WWI vintage, and have found one that is labeled as a 20's commercial rework Luger in 30 caliber. What I find confusing is that it has the imperial military acceptance stamp on it next to the other proofs. I have been unable to find a reference to the German military using 30 Luger in their pistols. It is possible they have the wrong caliber on it as the sellers are not really firearm experts. But, did they make them and accept them into military service?

If it is a rework, it means it was (re)made with parts, some of which may have been military such as the barrel extension. The German military by then didn't use the .30 Luger cartridge with the Luger, so it may have had, as part of the rework, a .30 Luger barrel put on it.

30 and 9mm bbls get swapped around all the time.

Post WW1 there were many military Lugers around and the government was not allowed to have so many extras by the Treaty with the allies. Mauser then took these and turned them into commercial models. Some are called double dates and will have say an 1918 date and a 1920 date. These could be in .30 Luger or in 9mm. Some had chamber stampings polished off and were stamped 1920 or were not stamped at all. Most of the ex-military pistols still have their original proof stamps along with newer ones when converted over. Those pistols made for export are stamped somewhere on the pistol with the word Germany.

They were adopted by the German military as the P08, in 9x19. Any other caliber is incorrect and a rework. Be patient. Although they can be expensive, there probably isn't a more common WWI/II pistol available on the market. The concept of supply & demand doesn't seem to work with Lugers.

It does have the Germany mark on it. Thanks for the information.