[mrerick]

This is one reason that, when I answer the question about what a collectible Luger is, I generally say that collectors value Lugers based on how close to their original factory state they are. Those that are most close to original factory state (the moment they left the factory) are valued the highest.

Finding matching numbers on a Luger is only part of what is necessary to determine this. Since parts can be replaced and numbered to the gun, or recycled and renumbered to the gun (forcing the match) you have to look closer.

On side plates from Mauser and DWM, this is why the number inside the plate (if present) is important. One in 10,000 will actually match the numbers properly. Other parts with numbers are one in 100. But even if the number matches properly, you still have to evaluate other characteristics to determine if the part was on the gun when it left the factory.

In some cases, you cannot really determine this. I just accept the match and move on.