Hi Lem,
thank you for responding! Lovely camera you have there, good company for the MP!
I had a PM from another RFF member today telling me the M3 went without top plate mounting screws from serial 780xxx or 782xxx onwards.
So, concluding that my black paint top plate does have the mounting screw holes but the black paint cameras were not sold before serial 959401, the top plate probably was an à la carte top plate manufactured at a later moment in time. Which might make it a (very?) rare item?
Still, I am using the camera with the black paint top plate regularly and one day it will probably look like the 'patina' M3 in the OP.
My black paint M3 is in a serious love affair with that certain Leitz Wollensak Velostigmat 50/3.5, for which I have found a matching Leitz NY hood now.