Finally I've found an early All black Nikkor 50mm f/1.4.
As you can read in the books by Bob Rotoloni, these are rather special lenses. The first series is from 1953, before the appearance of the black Nikon S2, about 400 pieces. At that time the Nikon S was produced. The black Nikon S is extremely rare, only a few were made, so why the early all black Nikkor 50mm f/1.4 was made? Nobody knows. Maybe Nippon Kogaku had plans for a black paint Nikon S, a very heavy camera. This all black lens is very light, made from aluminium, only 113 grams.
It looks nice on the black Nikon S2 however.