Welcome Tony,
The luger was made by Mauser in 1942; byf was the code for the Mauser Company. It appears to be all matching from what can be seen in the photos. You may want to disassemble to check to see if the hidden parts match. Many GI's had their guns plated after the war; it seemed like a good thing to do at the time. Do you know where your grandfather got the gun?
Tom
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