To my eye, either it never had a stock lug or the repair of the area from which one might have been removed is excellent.
Grinding off a stock lug to eliminate all traces of it does not leave enough material to present the same line as a frame that was built without. In other words, there's not a non lugged frame "inside" a lugged frame because the cuts for the lug go too deep.
It's also possible to spot refinish a discreet area of a Luger frame, as Ted Green once showed us in pics. We are patient enough to wait for better pics of this area, which may provide a clue. Alas, I'm not Krieghoff-savvy enough to know if this observation is even worthwhile.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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