The notch in the front of the receiver was required by a military directive in 1916 to be on all Lugers. It was so the receivers originally with a short barrel could be made into an Artillery (LP-08) Luger by simply changing the barrel. The notch allows the Artillery rear sight to sit properly.
Erfurt, a Royal Rifle Factory, followed the directive. DWM, a private contractor, only notched receivers that were actually made into an Artillery Luger.
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