If it is dated 1912 over the chamber, it was made by either DWM or Erfurt. It should be on top of the forward toggle. If not, it is a replacement toggle. Military serial numbers started at #1 at the beginning of each year from 1910 to 1921. Pictures of the proofs and acceptance stamps will determine the manufacturer. Erfurts will have acceptance stamps on almost every part including the grip screws.
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Mike C.
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