| Cup Winners Cup 1979/1980 - Appearances as Referee |  |
 |
 |
||||
| 19/09/1979 | SSW Innsbruck | - | TJ Lokomotíva Košice | 1:2 | - | - | - |
| 04/03/1980 | HNK Rijeka | - | Juventus | 0:0 | - | - | - |
| Cup Winners Cup 1979/1980 - Appearances as Referee | |
|
|
||||
| 19/09/1979 | SSW Innsbruck | - | TJ Lokomotíva Košice | 1:2 | - | - | - |
| 04/03/1980 | HNK Rijeka | - | Juventus | 0:0 | - | - | - |
| Complete name: | Johannes Nicolaus Ignacius Keizer |
| Born: | 06/10/1940 |
| Place of birth: |
Volendam, 
Netherlands |
| Nationality: |
Netherlands |