Presidents' Trophy Prior to 1926–27, the Stanley Cup was then awarded as a "World Series" trophy between the champions of the NHL and a rival league (first the Pacific Coast Hockey Association, then the Western Canada Hockey League). Instead, the NHL championship trophy during this era was the O'Brien Trophy. From 1917–18 to , the NHL season was split, requiring separate standings, with a single playoff series between the winner of the first half of the season and the winner of the second half of the season. After the 1925–26 season, the NHL became the only league left competing for the Stanley
Jim Mahon Memorial Trophy C League championship. Mahon moved up to the Peterborough Petes for the 1969–70 season, scoring 28 goals, 20 assists, and 48 points as a rookie in 46 games. In the 1970–71 season, he scored 45 goals, 44 assists, and 89 points in 62 games. In the summer of 1971, Mahon died in an electrical accident at his grandfather's home in Maidstone. Mahon would have been eligible for the 1972 NHL Amateur Draft. List of winners of the Jim Mahon Memorial Trophy. Jim Mahon Memorial Trophy The Jim Mahon Memorial Trophy is awarded annually by the Ontario Hockey League since 1972,