Luke:
Regarding the BO.25 stamp found on the bottom of the barrel on your DWM:
"Bohler Stahl bottom barrel proof found on 1913 and 1914 DWM and Erfurts used to indicate that the barrel was made of Bohler steel. This was a special hardening process of the barrel to be used with experimental steel bullets. This proof is usually found with two numerals folowing the proof which indicate the degree of hardness of the steel. In 1913 models the lowest number recorded is BO.23 and the highest number recorded is BO.26. These numbers are found in both the a and b range. The lowest number recorded in the 1914 model is BO.28 an the highest in 1914 is BO.32. The 1914 range is with the letter a".
Constanzo, World of Lugers, reference 41, pg168.
Still, Imperial Lugers, states that very few Lugers are found with this mark.
Good Hunting,
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