Mexican National Championships
... that the Mexican National Welterweight Championship, one of the Mexican National Championships, is the oldest still-promoted professional wrestling championship?
... that the <a href="./Mexican_National_Welterweight_Championship" id="mwgg" rel="mw:WikiLink" title="Mexican National Welterweight Championship">Mexican National Welterweight Championship</a>, one of the <b id="mwgw"><a class="mw-redirect" href="./List_of_Mexican_National_Championships" id="mwhA" rel="mw:WikiLink" title="List of Mexican National Championships">Mexican National Championships</a></b>, is the oldest still-promoted professional wrestling championship?