Agree with Ed. It's been reblued and appears to have suffered a bit of pitting prior to the refinish; maybe from being stored in a holster? The grips seem to show little wear indicating that it probably wasn't used much.
A mis-matched mag is very common. In case you don't know, in late 1916 the military ordered that all Lugers would have the receiver notched top front to allow use with an Artillery barrel. The notch is necessary for the adjustable rear sight to sit in. Erfurt, a Royal Arsenal, followed the directive but not 100%. (I have a 1917 Erfurt that isn't notched.) DWM, a private company, apparently didn't notch guns that were not intended to be Artillery models.
While your Luger isn't a prime collector's piece it has surely reached heirloom status within your family and that gives it immeasurable value for you. Thanks for allowing us to see it.
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