The exact answer to your question is "Yes"...
Rust Bluing was used by DWM and Erfurt. Early Swiss W+F Lugers are rust blued. Mauser did go through a transition that occurred over 1937. During that year, things start out as before, and a gradual shift takes place with some rust blued, some salt blued and even some mixed.
Interestingly, Mauser continued to rust blue some commercial Lugers after 1937. I have a 1938 commercial Mauser that is rust blued with strawed parts.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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