Please look very closely at the pictures of the Marans on ebay. I know the eggs show dark color in the pictures. But Marans have distinctly WHITE legs (this includes the copper/black etc). The pictures of the "sports" etc are dark and yellow legged. A sure sign of a cross to another breed.
IMHO if you are looking for "pure marans" look elsewhere.
IMHO if you are looking for "pure marans" look elsewhere.