Thanks everyone - he is 5 months old. I would like to sell him, and I know he is a purebred, so would one be comfortable advertising him as an Orp? Should I mention the very slight chance he could be a Lorp? I wont be selling him for much although I think he is a good quality roo.
I would be completely comfortable advertising him as an Orpington. Remember, the Australorp originated from the Orpington anyway. I doubt very, very much that he's an Australorp.