Unique breeds for sure. I've never heard of Copper Marans, though I have heard of Black Copper Marans. I've never heard of Speckled Legbar either. I don't know what country you are in, they may be recognized there. Or they may just be marketing names and not necessarily breeds.
What that does mean is that I'm not sure of their genetic make-up. You said only the dark chocolate eggs had hatched, no blue or green. So probably Marans in their background. some Marans have feathered legs, some don't. That gene for feathered legs is dominant so you can't necessarily go by that. That Legbar egg is green, not blue, but that is accepted. They don't have to be blue.
That was fun info but it really didn't change my mind. I still think they are of mixed genetics. It could be a lot of fun to see what they look like after they feather out and what colors of eggs the pullets lay.
What that does mean is that I'm not sure of their genetic make-up. You said only the dark chocolate eggs had hatched, no blue or green. So probably Marans in their background. some Marans have feathered legs, some don't. That gene for feathered legs is dominant so you can't necessarily go by that. That Legbar egg is green, not blue, but that is accepted. They don't have to be blue.
That was fun info but it really didn't change my mind. I still think they are of mixed genetics. It could be a lot of fun to see what they look like after they feather out and what colors of eggs the pullets lay.