QUAKER OATS <OAT> SELLS UNIT TO KEYSTONE The Quaker Oats Co said it sold its Vernell's Fine Candies Inc unit to privately-held Keystone Partners Inc for an undisclosed price. The company said Vernells had sales of around 30 mln dlrs in the year ended in August, 1986. Quaker Oats acquired Vernells in August, 1986 when it purchased Golden Grain Macaroni Co.