Bob,
What you have pictured here is definitely a DWM receiver holding an Erfurt toggle train. An additonal characteristic, which is just out of your photo, is the front edge of the top of the receiver. All Erfurt receivers after 1914 were cut with a flattened area for an Artilley rear sight; DWM did not follow this practice.
On the frame, if the script letter is right under the serial number, it is part of the number itself--the letter suffix. If there is not a crown/letter directly on the front of the trigger guard it is not an Erfurt frame.
I suspect that you understand this, but if you are looking for a collection-quality Luger this is not the one.
--Dwight
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