Toyota International Series

The Toyota International Series was a professional women's tennis circuit administered by the Women's Tennis Association that was founded in 1977 as the Colgate International Series it consisted of tournaments absorbed from the ILTF Women's International Grand Prix and included all those worldwide events that were not part of the Virginia Slims Circuit whose tournaments were mainly in the United States. In 1979 it was renamed as the Colgate Series.

Source: Wikipedia — Toyota International Series (CC BY-SA 4.0)