You can check the serial number to enable an expert to know who the manufacture is as there were at least 3 different ones.
If you want to check with Walther you can email them
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If its a standard blued finish no special marking, it worth $425.
If it has the proper markings it can be worth as much as
$2500. The Holster can be worth as much as $700 if it has NSKK, DRGM, or AKAH markimgs.
If it has NSDAP its Nazi era pistol. It adds value.
