JohnF, look at the eagle on the right side of the slide. If it appears to be holding a cross in one talon and a champaigne glass in the other talon, that's an Erfurt eagle proof and the slide will be Erfurt-made. A DWM eagle will have feet that appear to be almost like a ball... at least that's the best way I can describe it.
Look on the front of the trigger guard. If there is a crown over a gothic letter stamped on it, the frame is Erfurt. DWM did not stamp theirs that way. There may also be a "lazy" small crown over a letter stamped on the raised part of the frame on the left side just in front of the sideplate. That, too, is an Erfurt inspection stamp. Again, DWM did not mark their Lugers in this fashion.
Your description indicates that your Luger was an East German rework and be aware that they may have placed some stamps on the gun. A common one is a shield with a number inside of a starburst. Another, often found on the front of the frame near the serial number is a circle with an "X" inside. These are not factory stamps by either Erfurt or DWM. If you have questions about any markings on your pistol, pictures would help the forum members to identify them.
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