I am no expert, but I have owned 2 1916 DWMs; one had mis-matched #s, had been re-blued and re-barreled. The other has matching #s and the original finish.

Both were a lot of fun to shoot and surprisingly accurate (if you can see the tiny sights!).

I sold the shooter-grade gun and I'd like to have it back.

Someone else has already said it, but every collection ought to have at least one Luger.