| Eredivisie 1970/1971 - Appearances as Referee |  |
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| 07/02/1971 | AZ '67 Alkmaar | - | FC Utrecht | 1:3 | - | - | - |
| 16/05/1971 | Telstar | - | DWS Amsterdam | 1:1 | - | - | - |
| Eredivisie 1970/1971 - Appearances as Referee | |
|
|
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| 07/02/1971 | AZ '67 Alkmaar | - | FC Utrecht | 1:3 | - | - | - |
| 16/05/1971 | Telstar | - | DWS Amsterdam | 1:1 | - | - | - |
| Complete name: | Siem Wellinga |
| Born: | 09/03/1931 |
| Place of birth: |
Netherlands |
| Residence: | Boekelo |
| Nationality: |
Netherlands |