| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Martsel Yosif•Koen | |
| Used name | Martsel•Koen | |
| Original name | Марцел Йосиф•Коен | |
| Born | 5 July 1933 in Plovdiv, Plovdiv |  BUL |
| Measurements | 170 cm / 74 kg | |
| NOC | Bulgaria | BUL |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1960 Summer Olympics | Shooting | BUL |
Martsel Koen | |||
| Small-Bore Rifle, Prone, Men (Olympic) | 8 | |||||
| 1964 Summer Olympics | Shooting | BUL |
Martsel Koen | |||
| Small-Bore Rifle, Three Positions, Men (Olympic) | 23 | |||||
| Small-Bore Rifle, Prone, Men (Olympic) | 25 | |||||
| 1968 Summer Olympics | Shooting | BUL |
Martsel Koen | |||
| Small-Bore Rifle, Three Positions, Men (Olympic) | 21 | |||||
| Small-Bore Rifle, Prone, Men (Olympic) | 24 |
