Vintage 1961 Ken "In Training" outfit #780.  The set is complete and includes a white tee shirt with mock turtleneck collar, red and white polka dot boxers and white nylon briefs, plus a pair of black plastic dumbbells and a green "How to Build Muscles" book.  All the pieces are in very good condition except the red boxers in which the elastic has come unsewn on one side.  They can be repaired but not with these old fingers.