Technically its not a "spotted" tabby, but its a broken mackerel pattern. The spotted tabby would not have spots in rows but would be more random.
A true spotted tabby would be like the Mau, Ocicat or Bengal. He could be a cross of a spotted and a mackerel and that's why he has more broken stripes that became spotted.
Willing to bet when a small kitten (under 2 months old), those spots were closer together on the body and as he grew, the spots/stripes stretched out.
He's a very handsome cat tho

Unless the color is "off" in the picture he's not a brown tabby - he's a silver tabby.