Kato Masao vs Hisai Keishi not seen; Hisai Keishi lost
Kato Masao played B (has W 4 times already)

On the other hand: X01.sgf
1969-11-19  25th Honinbo  League  177  B+  Kano Yoshinori  Iwata Tatsuaki  X01.sgf
has the wrong players (or event).
Could this be the missing Kato-Hisai game?