It is a good question and we are getting closer to answering it. The main problem is the duration of the period the luger was made (some 50 years) during which the German standards developed into the DIN standards, which have now been surpassed by ISO standards.
Documentation dating from 1937 shows a number of DIN steel types and shapes (like round bar, squared bar, etc..) but it's a challenge to find the correct specifications and references.
I can give a couple of steel types:
Frame: DIN steel 50.11, forged.
Toggle and receiver parts, most stress parts: DIN steel C 25.61 and DIN steel C 60.61. Many of these in round bar or squared bar 'raw' shape.
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