| KNVB beker 1969/1970 - Appearances as Referee |  |
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| 14/12/1969 | SBV Excelsior | - | Holland Sport | 4:2 pso | - | - | - |
| 12/04/1970 | AZ '67 Alkmaar | - | AFC Ajax | 2:1 | - | - | - |
| 27/05/1970 | PSV Eindhoven | - | AFC Ajax | 0:2 | - | - | - |
| KNVB beker 1969/1970 - Appearances as Referee | |
|
|
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| 14/12/1969 | SBV Excelsior | - | Holland Sport | 4:2 pso | - | - | - |
| 12/04/1970 | AZ '67 Alkmaar | - | AFC Ajax | 2:1 | - | - | - |
| 27/05/1970 | PSV Eindhoven | - | AFC Ajax | 0:2 | - | - | - |
| Complete name: | Wilhelmus Jacobus Maria Schalks |
| Born: | 21/03/1923 † 25/10/2017 |
| Place of birth: |
Leiden, 
Netherlands |
| Residence: | Leiden |
| Nationality: |
Netherlands |