| KNVB beker 1983/1984 - Appearances as Referee |  |
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 |
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| 10/01/1984 | Roda JC Kerkrade | - | Fortuna Sittard | 1:2 | 1 | - | - |
| 31/01/1984 | AFC Ajax | - | Feyenoord | 2:2 | - | - | - |
| KNVB beker 1983/1984 - Appearances as Referee | |
|
|
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| 10/01/1984 | Roda JC Kerkrade | - | Fortuna Sittard | 1:2 | 1 | - | - |
| 31/01/1984 | AFC Ajax | - | Feyenoord | 2:2 | - | - | - |
| Complete name: | Johannes Nicolaus Ignacius Keizer |
| Born: | 06/10/1940 † 18/11/2024 |
| Place of birth: |
Volendam, 
Netherlands |
| Nationality: |
Netherlands |