On April 29, 1973, “Othello,” a nationally popular board game, was released.
The trademark “Othello,” which designates “board games” as the goods covered, is a registered trademark of Othello Co., Ltd. Incidentally, “Reversi” is now in the public domain. (p)
Reference Links
Reversi – Wikipedia
https://www.j-platpat.inpit.go.jp/c1801/TR/JP-1972-164192/40/en