Well he has a rose comb, and is buff in color. Clean legged. Upright tail. Are his ear lobes white or red I can't tell by the picture. Do you know what other breeds the people you got him from have. Is possibly a cross of what they have? Are those spurs that I see? Or a fifth toe? If those spurs are that long I would question that he is 25 weeks old. He may be a buff leghorn if he has white earlobes and is a full size chicken. There are banty breeds that look like that.