| KNVB beker 1963/1964 - Appearances as Referee |  |
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| 29/09/1963 | Dordrechtsche FC | - | Willem II | 3:4 aet | - | - | - |
| KNVB beker 1963/1964 - Appearances as Referee | |
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| 29/09/1963 | Dordrechtsche FC | - | Willem II | 3:4 aet | - | - | - |
| Complete name: | Gerard Klaassens |
| Born: | 07/02/1931 |
| Place of birth: |
Netherlands |
| Residence: | Venlo |
| Nationality: |
Netherlands |