| Eredivisie 1968/1969 - Appearances as Referee |  |
 |
 |
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| 07/04/1969 | PSV Eindhoven | - | GVAV Groningen | 0:0 | - | - | - |
| 27/04/1969 | Go Ahead | - | ADO | 2:1 | - | - | - |
| 26/05/1969 | SC NEC | - | NAC Breda | 1:1 | - | - | - |
| Eredivisie 1968/1969 - Appearances as Referee | |
|
|
||||
| 07/04/1969 | PSV Eindhoven | - | GVAV Groningen | 0:0 | - | - | - |
| 27/04/1969 | Go Ahead | - | ADO | 2:1 | - | - | - |
| 26/05/1969 | SC NEC | - | NAC Breda | 1:1 | - | - | - |
| Complete name: | Johannes Nicolaus Ignacius Keizer |
| Born: | 06/10/1940 † 18/11/2024 |
| Place of birth: |
Volendam, 
Netherlands |
| Nationality: |
Netherlands |