Mike, I was hoping some "experts" would show up and help. From my limited experience, let me take a weak stab at this;
Made in 1916 by DWM, it then received a 1920 reichwehr property stamping.
The number 0.1564 on the grip strap appears to me to be a navy stamping, which I am sure is why you have commented on it. This marking was for identification for a unit, meaning that when the weapon was assigned it was given a seperate number. Hopefully others can give you more information on this.
Your holster being from 1938, at least shows you have a holster from the nazi era to match your WW1, then weimar, then WW2 era "rig".
Value is hard, true navy pieces and unless yours has other acceptance markings, could be a fake, but I don't know. Can you provide clear upclose pictures of the markings on left and right?
Shooter price start around $450 and then go up, navies can be fairly expensive, going for several thousand, but unless you can get it proven to be a navy, and not reblued, then value is not anything like that.
Also, you can always change a posting by clicking on the icon that looks like a pencil and paper, then you can fix any mistakes in spelling, such as lugar when it should be luger, ;>)