 King would precede Coburn as the world heavyweight champion.Around 1865, According to the "Irish Post", Coburn defeated world and American champions Joe Goss and Tom Allen, as well as Bill Rayel in Great Britain, in a build up for a future fight with American Jem Mace.He fought at around 190 pounds during his British tour, certainly a heavyweight, and a good bit heavier than he fought in his earlier boxing career.