| KNVB beker 1973/1974 - Appearances as Referee |  |
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 |
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| 12/03/1974 | PSV Eindhoven | - | Feyenoord | 2:0 | - | - | - |
| 03/04/1974 | AFC Ajax | - | PSV Eindhoven | 1:2 | - | - | - |
| KNVB beker 1973/1974 - Appearances as Referee | |
|
|
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| 12/03/1974 | PSV Eindhoven | - | Feyenoord | 2:0 | - | - | - |
| 03/04/1974 | AFC Ajax | - | PSV Eindhoven | 1:2 | - | - | - |
| Complete name: | Johannes Nicolaus Ignacius Keizer |
| Born: | 06/10/1940 † 18/11/2024 |
| Place of birth: |
Volendam, 
Netherlands |
| Nationality: |
Netherlands |