To determine if a stock lug has been removed, the lower back of the grip needs to be seen. However, there is a clue that it may not have had a stock lug. Two things happened in 1913; the stock lug first appeared on late year production as standard and the military issued instructions that the hold open device would be included on all new production.
Lugers made for the military in 1909 through early 1913 did not have a hold open. Those made without the hold open could be returned to the Royal Erfurt Rifle Factory to be modified and that one has been. On the right side of the frame behind and above the trigger is a small crown/letter stamp showing that it was modified to have the hold open. If originally made without the hold open the odds are that it also did not have a stock lug.
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