jacobje jantje "cobie" buter (also coby; born 17 may 1946) is a retired dutch swimmer who won the bronze medal in 100 m backstroke at the 1970 european aquatics championships. she also competed at the 1968 summer olympics and finished seventh in the 4 × 100 m medley relay. she helped the dutch team to set a new european record in the same event in 1968. between 1965 and 1970 she won four national titles and set four records in the 100 m backstroke.