| KNVB beker 1990/1991 - Appearances as Referee |  |
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 |
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| 13/10/1990 | Quick Boys | - | Helmond Sport | 5:2 | - | - | - |
| 26/11/1990 | Rijnsburgse Boys | - | Dordrecht '90 | 0:2 | - | - | - |
| 14/12/1990 | SVV Schiedam | - | Fortuna Sittard | 2:1 | 4 | - | - |
| KNVB beker 1990/1991 - Appearances as Referee | |
|
|
||||
| 13/10/1990 | Quick Boys | - | Helmond Sport | 5:2 | - | - | - |
| 26/11/1990 | Rijnsburgse Boys | - | Dordrecht '90 | 0:2 | - | - | - |
| 14/12/1990 | SVV Schiedam | - | Fortuna Sittard | 2:1 | 4 | - | - |
| Complete name: | Jan Dolstra |
| Born: | 11/01/1952 |
| Place of birth: |
Nijehaske, 
Netherlands |
| Nationality: |
Netherlands |