Then it's a mixed breed. My first though is someone's Olive Egger project. The Marans for the dark egg gene often have feathered legs, and the beard/muffs/pea comb come from an Ameraucana parent. Of course, since he's not laying eggs, it's kind of hypothetical.
This Pullet is from the same brood. I believe you are right about Olive Egger project. He told me they were Ameraucanas but when they started to grow I didn't think so. I looked back at the add and it said Americaunas spelt with an I. So then I just figured Easter Eggers. Someone today told me Olive Egger. He did have Marans and Pure Ameraucanas.