| KNVB beker 1970/1971 - Appearances as Referee |  |
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| 16/08/1970 | SC Cambuur | - | EDO Haarlem | 3:1 | - | - | - |
| 08/11/1970 | Racing Club Heemstede | - | MVV | 2:0 | - | - | - |
| KNVB beker 1970/1971 - Appearances as Referee | |
|
|
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| 16/08/1970 | SC Cambuur | - | EDO Haarlem | 3:1 | - | - | - |
| 08/11/1970 | Racing Club Heemstede | - | MVV | 2:0 | - | - | - |
| Complete name: | Siem Wellinga |
| Born: | 09/03/1931 |
| Place of birth: |
Netherlands |
| Residence: | Boekelo |
| Nationality: |
Netherlands |