Charlie, welcome to the forum.
Please take a moment to create a profile, and to read the Forum Decorum under general information to give you a grasp of the operation of the forum. All those with an interest in the Luger pistol are welcome here.
The sercial number stamping on your BYF 42 is correct. The letter suffix appears only on the frame.
One of the members who have a manufacturing production list will have to answer your question about the specific date of manufacture. The only thing I know for sure is that it was made in 1942
Come back often...
-John
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