I'd thought about Legbar, with his pretty barring. But, Legbars are crested and the crest is partially dominant, and I don't see any signs of a crest on this boy. Legbars also have white earlobes. I'm not clear on the genetics of earlobe color, but the crosses I've seen have partially white earlobes.
He's a beautiful boy. The OP could put him over white egg layers and see what color the offspring pullets lay.
Ah yes, Iv'e forgotten about the crest.