Easter Egger.
This is how I can tell; His comb is oversized, indicating that he is impure for the pea comb gene. His colouring is also not a standard colour (which I believe Ameraucana have to have to be referred to as such. He looks to have genes for silver and gold, as well as the mahogany gene darkening that patch along his back to a red colour, and blue, lightening the chest area to that pretty slate colour.
We don't have Ameraucana in the UK, so I can't tell you exactly what they should look like; hopefully someone can come along with some nice examples for you.