| KNVB beker 1974/1975 - Appearances as Referee |  |
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 |
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| 23/11/1974 | HFC Haarlem | - | De Graafschap | 3:1 | - | - | - |
| 16/04/1975 | IJsselmeervogels | - | FC Twente '65 | 0:6 | - | - | - |
| KNVB beker 1974/1975 - Appearances as Referee | |
|
|
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| 23/11/1974 | HFC Haarlem | - | De Graafschap | 3:1 | - | - | - |
| 16/04/1975 | IJsselmeervogels | - | FC Twente '65 | 0:6 | - | - | - |
| Complete name: | Johannes Nicolaus Ignacius Keizer |
| Born: | 06/10/1940 |
| Place of birth: |
Volendam, 
Netherlands |
| Nationality: |
Netherlands |