The "Barnevelder" around that time really came in all imaginable colors, but the double laced black, white and black were the only ones that were being standardized at that time. It would not be very hard to make a speckled Barnevelder, but is it really needed as we have other much more interesting colors to play with that really belong to the Barnevelder?The poultry geneticist Arend Lourens Hagedoorn has create them in the 1930's. Animal breeding, 1939
There is also a picture of a tollbunt Barnevelder hen published in "The Barnevelder, Powell-Owen, 1932.
Piet