Hi Johnny, I can't answer your question exactly, but. . . I have byf 42s and they have either black bakelite or numbered grips. My impression is that they should be numbered or at least marked with the E/135 Waffenamt Marks. I have seen some with very faint E/135 marks.
I would NOT accept a byf as all matching, without matching grips. At least that's my opinion!!
Your grips appear to be legit!!
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