Wyandottes have rose combs and yellow legs. The bird in the photo has a rose comb and blue legs.
Sebrights are SUPPOSED to be hen feathered, not all of them are, and it is a fault if they are. Not everyone likes the hen-feathering and hatchery birds are notorious for cock-feathering in Sebrights. Single combs are also becoming more and more common in hatchery birds as well.
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Agreed. That is a Sebright. Also, roosters that are hen-feathered can have fertility problems which is why some breeders use these non-hen-feathered birds. And that is a rosecomb on its head. Looks practically identical to my rooster's comb.