The "S/42" was a concealment code for Mauser manufactured products, and used on armorer's replacement magazines and parts.
The SE/63 was an inspection acceptance mark indicating that a government inspector confirmed that the item met contract specifications and requirements at the time the government acquired it from Mauser.
A particularly correct armorer would have the dies and take the time to number the replacement magazine to the firearm. Many did not.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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