| KNVB beker 1963/1964 - Appearances as Referee |  |
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| 29/09/1963 | HVC Amersfoort | - | RC&FC Sparta | 0:2 | - | - | - |
| 17/11/1963 | EDO Haarlem | - | Feijenoord | 0:3 | - | - | - |
| 09/02/1964 | RC&FC Sparta | - | AFC Ajax | 0:1 | - | - | - |
| KNVB beker 1963/1964 - Appearances as Referee | |
|
|
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| 29/09/1963 | HVC Amersfoort | - | RC&FC Sparta | 0:2 | - | - | - |
| 17/11/1963 | EDO Haarlem | - | Feijenoord | 0:3 | - | - | - |
| 09/02/1964 | RC&FC Sparta | - | AFC Ajax | 0:1 | - | - | - |
| Complete name: | Wilhelmus Jacobus Maria Schalks |
| Born: | 21/03/1923 † 25/10/2017 |
| Place of birth: |
Leiden, 
Netherlands |
| Residence: | Leiden |
| Nationality: |
Netherlands |