What breed: Egyptian Fayoumi? Iowa Blue? Easter Egger? Roadrunner?

[Lady of McCamley]

He's definitely Birchen...and I too am not sure what breed.

Single combs can happen in EEs as they are hybrids of hybrids in most hatchery lines by now. (They always were a hybrid).

If legs are green, my best guess is EE.

LofMc