sounds like a mismatch, pictures would help, but yes, whatever number is on the frame, should have the last 2 of the serial number on most small parts.
The receiver was made in 1937, the S/42 would be correct also and stands for Mauser.
We all do silly things like steel wool, etc on items when we are smaller.
Welcome to the forum
Ed
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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