From what we can see;
byf (Mauser code) made in 1942
You'll want to see if the last two are on all the small parts, disregard some internal numbering that doesn't look like the numbers on the outside.
Do you have any story of how it was picked up by yur grandpa?
Nice heirloom, 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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