Achievements
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Competing in two Summer Olympics, he won a bronze in the K-2 1000 m event at Mexico City in 1968. Seibold also won four medals at the International Coach Federation Canoe Sprint World Championships with a gold (K-2 1000 m: 1970), two silvers (K-2 1000 m: 1971, K-4 1000 m: 1966), and a bronze (K-2 500 m: 1970).
