| KNVB beker 1974/1975 - Appearances as Referee |  |
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| 28/12/1974 | SC Heracles '74 | - | AFC Ajax | 4:2 aet | 1 | - | - |
| KNVB beker 1974/1975 - Appearances as Referee | |
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| 28/12/1974 | SC Heracles '74 | - | AFC Ajax | 4:2 aet | 1 | - | - |
| Complete name: | Gerard Jonker |
| Born: | |
| Place of birth: |
Netherlands |
| Nationality: |
Netherlands |