The changes occurred mainly in 1913 for stock lug, and in 1914 for hold open.
Stock lugs became standard on Lugers delivered after August 1913.
Jan C. Still in his "Central Powers Pistols" refers that the stock-lug started around serial number 6000a (between 3980a and 7825a) but did not mention the exact serial number for the change of the hold open, which started according a directive dated 6th May 1913.
The hold open transition apparently occurred in a range of about 1,538 guns between 9454 and 373a; while the addition of the stock lug appears to have occurred between 4918a and 5609a.
DWM 1900 DWM 1900/06 W+F 1906 and W+F 1906/29 do not have any stock lug
Some sort of stock lug can be found on 1900 and 1906 "American Eagle" DWM lugers fitted with smooth Ideal stock walnut grips to match the US made Ideal stock.
My 2 cents.
Sergio
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"Originality can't be restored and should be at the top of any collector's priority list.
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