That is a Barred Rock cockerel. Trust me. Raised many of them.
http://www.dominiquechicken.com/Sexing_Dominique_chicks.html
This link is good for Barred Rocks, Cuckoo Marans and Dominiques and has very good photos.
http://www.dominiquechicken.com/Sexing_Dominique_chicks.html
This link is good for Barred Rocks, Cuckoo Marans and Dominiques and has very good photos.