The Old Meijin was a Go competition.
Outline
The Old Meijin was the same tournament as the current Meijin, but is called the "Old Mejin" because before 1976, the tournament was hosted by Yomiuri Shimbun. In 1976, Yomiuri Shimbun stopped hosting the Meijin, and started the Kisei. The Meijin tournament then was hosted by another company, Asahi. This tournament thus became called the Old Meijin.
References
Old Meijin Wikipedia(Text) CC BY-SA