Undisputed champion recognised a different champion. The disputes were usually short-lived as a lucrative fight would be organised between the rival champions. The longest split was ten years, of the middleweight title, between Mickey Walker's move up to heavyweight in 1931 and NBA champion Tony Zale's defeat of NYSAC contender Georgie Abrams in 1941. An early use of "undisputed" appears in a "New York Times" preview of the 1941 fight. The growing popularity of boxing outside of the USA led to creation of various boxing organizations, each strengthening their influence (most notably BBBofC) and having their own champion. This resulted in a
Derek Minter riding Nortons in home short circuit races. The new team were to use older 1950s Gileras on which former World Champion rider Duke had much success, but which with the newer, upgraded tyre technology of the 1960s were considered still competitive. The team was devised by Duke to challenge the domination of Mike Hailwood on the MV, and had early successes at Silverstone and Brands Hatch in the UK, and Imola in Italy. In May 1963, whilst riding a 500 cc Manx Norton at Brands Hatch, Kent, Minter was involved in a battle for the lead with Dunstall Norton rider