The first time Vesper competed, in 1964, he did not win a medal. However, the second time, in 1968, Vesper won a gold medal in the Greco-Roman wrestling event.
Vesper also competed for East Germany in the FILA Wrestling World Championships. Upon his first appearance, 1963, in Helsingborg, he came in second in the Greco-Roman event. He competed in the 78kg weight class and the Seniors age group. His second appearance, in 1967, held in Bucharest, also resulted in a silver medal in the Greco-Roman event. He competed in the Seniors age group and the 78 kg weight class.
Sources
Rudolf Vesper at the International Wrestling Database