Analysis of information sources in references of the Wikipedia article "World Boxing Organization" in English language version.
The WBO, which was introduced in 1989, was not generally considered a legitimate heavyweight belt at the time. The organization's first heavyweight champion was Francesco Damiani whose short reign came during Mike Tyson's run as undisputed champion.
For the purpose of unification of titles, the Champions of the World Boxing Association ('WBA') and the World Boxing Council ('WBC') may be designated as 'elite contenders' and may be permitted to fight for the unified title. Unification bouts with other organizations will be considered on a case to case basis.
And the WBO belt has NEVER been carried into the ring by the true heavyweight champion of the world. The first WBO heavyweight beltholder was Francesco Damiani, who won the bauble by knocking out Johnny DuPlooy in 1989
