In Britain, that's what they call a cross between a metallic (or
hikari) koi (i.e., Japanese nishikigoi) and a common carp.
As such, they don't have the color and pattern characteristics one associates with koi. They'll look like common, everyday flock-spawned guess-a-goi with a metallic skin because they are everyday flock-spawned guess-a-goi. Hope that helps.