Ken, introduced by Mattel in 1961 as Barbie's steady boyfriend, has gone through many incarnations over the decades. Ken was created just two years after Barbie and has been produced every year since, except in 1968 when Mattel decided to change his body mold. Today's Ken still uses the 1968 body mold, so collectors use the stamp on the back of each head mold to determine the era in which the doll was made. There are approximately 247...Continue Reading