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I was wondering why you think so. Wyandottes usually have rose combs, which are dominate over single combs. A GLW cross would most likely result in a rose, or walnut combed bird. Some Wyandottes do pop up with a single comb (I have one, but she has not passed it on to any chicks), but it is not the norm. GLWs have yellow/orange legs (at least all of mine do). Even those that I've crossed with my slate legged EEs end up with a lighter shade, than the O.P.'s hen. These two things would lead me to belive it's not a GLW cross.