If the ground colour is black it's a birchen. If it's blue it's a Silver Blue. Kind of hard to tell the ground colour from your picture.
Definately not a Silver Duckwing-pattern is wrong.
Thanks I have only just purchased the modern game and am also new to poultry,I have a blue hen,birchen hen and 2 silver duckwing hens beside this cockerel,my question is what colours can I put together,Thankas in advance