| KNVB beker 1977/1978 - Appearances as Referee |  |
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| 19/11/1977 | AFC Ajax | - | Telstar | 4:1 | - | - | - |
| 05/05/1978 | AZ '67 Alkmaar | - | AFC Ajax | 1:0 | - | - | - |
| KNVB beker 1977/1978 - Appearances as Referee | |
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|
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| 19/11/1977 | AFC Ajax | - | Telstar | 4:1 | - | - | - |
| 05/05/1978 | AZ '67 Alkmaar | - | AFC Ajax | 1:0 | - | - | - |
| Complete name: | Siem Wellinga |
| Born: | 09/03/1931 |
| Place of birth: |
Netherlands |
| Residence: | Boekelo |
| Nationality: |
Netherlands |