| Cup Winners Cup 1965/1966 - Appearances as Referee |  |
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| 24/11/1965 | West Ham United | - | Olympiakos Piraeus | 4:0 | - | - | - |
| Cup Winners Cup 1965/1966 - Appearances as Referee | |
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| 24/11/1965 | West Ham United | - | Olympiakos Piraeus | 4:0 | - | - | - |
| Complete name: | Karl Keller |
| Born: | 01/04/1923 |
| Place of birth: |
Switzerland |
| Residence: | Basel |
| Nationality: |
Switzerland |