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Looks like polydactyly, excess toes. See this link for explanation.
http://sellers.kippenjungle.nl/page3.html
If this is a breeding bird, be careful, since it's a dominant trait.
If you are not breeding this bird, then no problem. You won't see health issues as a result, in my experience But you will be able to tell it from the rest of your chickens!
The extra toes are not always fully developed limbs. Sometimes a toenail is all there is.