| KNVB beker 1976/1977 - Appearances as Referee |  |
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| 20/11/1976 | De Graafschap | - | SC NEC | 2:0 | - | - | - |
| 08/03/1977 | FC Den Haag | - | PSV Eindhoven | 8:7 pso | 1 | - | - |
| KNVB beker 1976/1977 - Appearances as Referee | |
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|
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| 20/11/1976 | De Graafschap | - | SC NEC | 2:0 | - | - | - |
| 08/03/1977 | FC Den Haag | - | PSV Eindhoven | 8:7 pso | 1 | - | - |
| Complete name: | Siem Wellinga |
| Born: | 09/03/1931 |
| Place of birth: |
Netherlands |
| Residence: | Boekelo |
| Nationality: |
Netherlands |