| KNVB beker 1971/1972 - Appearances as Referee |  |
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| 06/01/1972 | DWS Amsterdam | - | ACV Vitesse | 1:0 | - | - | - |
| 12/04/1972 | FC Den Haag-ADO | - | WVV Wageningen | 2:0 | 3 | - | - |
| KNVB beker 1971/1972 - Appearances as Referee | |
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| 06/01/1972 | DWS Amsterdam | - | ACV Vitesse | 1:0 | - | - | - |
| 12/04/1972 | FC Den Haag-ADO | - | WVV Wageningen | 2:0 | 3 | - | - |
| Complete name: | Johannes Nicolaus Ignacius Keizer |
| Born: | 06/10/1940 |
| Place of birth: |
Volendam, 
Netherlands |
| Nationality: |
Netherlands |