Thanks for the info on the black skin...I was mis-informed on that part...still could be part of your breed OP...with the game bird look....Silkie could be a likely choice then for black skin and feathering....
Only way to know would be to do a genetic test as it can be very surprising what the toss of the genes turned up.
No matter...pretty birds. Mutts are healthy and happy birds from my experiences.
Lady of McCamley