Following the name of the champion(s): Indicates the number of times the competitor has held that title at that point.
[...]
Indicates a gap in the listing where title changes are not known.
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Title was held or changed hands no later than this. In these cases, it is known that a competitor held the title at a certain time but not when he/she won it.
@
Order uncertain. Different titleholders may be known for the same year, for example, but it is not known who held the title before whom.
#
Unofficial or disputable claims. These are usually matches that certainly took place, but where there is doubt that the competitor shown should be recognized as a true title holder. These listings are also italicized.
World Middleweight Title [unlineal / disputed versions]
* Bolded letters in the competitor's name, if any, indicate the surname/family name.
Denny Harrington
1878-03-12
London, ENG, GBR
English champion, defeats George Rooke, billed as American champion, to claim the world title; still champion as of 80-12-17.
George Gardner
1901-07-04
San Francisco, CA, USA
Defeats Jack Moffat for the world title and is also recognized as American champion; still champion as of 01-12-10; listed as light heavyweight champion as of 02-12 (Chicago Tribune, 02-12-14; The Evening World, New York, NY, USA, 02-12-31).