William Berntsen
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| Full name | William Eldred Berntsen | |||||||||||||||||
| Nationality | Danish | |||||||||||||||||
| Born | 25 March 1912 Jersie, Denmark  | |||||||||||||||||
| Died | 14 September 1994 (aged 82) Frederikssund, Denmark  | |||||||||||||||||
| Height | 170 cm (5 ft 7 in) | |||||||||||||||||
| Weight | 70 kg (154 lb) | |||||||||||||||||
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Medal record 
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William Eldred Berntsen (25 March 1912 – 14 September 1994) was a Danish competitive sailor and Olympic medalist. He won a silver medal in the 5.5 Metre class at the 1960 Summer Olympics in Rome, together with Søren Hancke and Steen Christensen.