What metal was use in production?

[Steinar]

Originally posted by John Sabato
The only way to be certain would be to get a shooter Luger for testing and have the various parts hardness tested using Rockwell or Brinell tests... and then torture test those parts for durability.

I beleve Gerben found a good answer to the question, but if someone has the will and the equipment to do a test like John S. suggested, I can provide a broken frame and and probably some toggle parts. I have some chrap laying around perfect for this.. (both DWM and Mauser frames) just let me know