This color pattern is technically known as Black Winged Narragansett and is the result of the action of a recessive genetic factor on the Narragansett pattern, which is a recessive allele to both black and bronze patterns -- B (black), b (normal wild bronze), and b' (black winged bronze). The b' allele is also what gives Royal Palm, Calico, and Sweetgrass birds their solid slatey-black wings.
The primaries are solid black. Lower secondaries are silver overlaid. The main tail is tan, irregularly penciled with black, bordered front and rear by a narrow black band, and terminated by a broad band of pure white.
The hens tend to be a bit lighter colored than the tom because of more distinct white lacing on the tips of their body feathers.
The poult color/pattern is nearly identical to the black winged bronze.
Purebred genotype: b'b' nn for toms and b'b' n- for females.
Black winged bronze based with the Narragansett factor.
This is the pure true breeding type.
They basically look like a typical Narragansett except for the solid black primary and silver secondary wing feathers.
Black Winged Narragansett pattern at hatch.