| KNVB beker 1972/1973 - Appearances as Referee |  |
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 |
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| 09/12/1972 | SBV Excelsior | - | FC Utrecht | 2:1 | 3 | - | - |
| 27/01/1973 | RC&FC Sparta | - | FC Amsterdam | 1:0 | - | - | - |
| KNVB beker 1972/1973 - Appearances as Referee | |
|
|
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| 09/12/1972 | SBV Excelsior | - | FC Utrecht | 2:1 | 3 | - | - |
| 27/01/1973 | RC&FC Sparta | - | FC Amsterdam | 1:0 | - | - | - |
| Complete name: | Johannes Nicolaus Ignacius Keizer |
| Born: | 06/10/1940 |
| Place of birth: |
Volendam, 
Netherlands |
| Nationality: |
Netherlands |