Anttom, if you are looking at an auction by jlh409, the serial number is 2867p, NOT 2867n. The suffix is quite frequently in error. It is difficult to know the difference unless you've seen them side by side.
Regarding the black Bakelite Grips, there is a difference of opinion as to the correctness. My opinion is they should not be original before the "U" Block of the 41 byf Lugers. Some folks disagree with me. You decide for yourself.