Hold on there Alf...
You just changed the mix...
Here are your original words:
</font><blockquote><font size="1" face="Verdana,Tahoma,Arial,Helvetica,Geneva">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva"> DWM 1917, all parts original with 1 original wood based mag. Seller is asking $900. </font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">A MATCHING serial numbered mag, is NOT the same as an original wood based mag... Add at least $50 for a matching serial numbered mag IF, and ONLY IF, you can be sure the mag # isn't a fake...
You also stated "original parts"... that is NOT the same as all matching numbered parts... If that is the case, you can increase the anty about another $100... even for the level of finish you have described.
Other things that may affect the value is if the gun has been refinished at any time in it's life by anyone other than the factory...
Since you can't be sure of all these things, it would be better to find another Luger where you can trust what you are buying by getting a good look ahead of time.
If you just want a Luger to shoot, and condition is not that important except you don't want a rust bucket, then the price range of $500-700 is about right for a gun in good mechanical condition.
Decide on what you can afford, and then place an ad in the Wanted forum... those that have Lugers available will beat a path to your door... and you can ask for photos that you can post here for a closer appraisal of it's value.