Mark 1 is a heel seat and sides lasting machine which combined with a pulling-over lasting machine realizes the complete lasting of man and lady footwear with any heel heigth, with the opportunuty for Good-Year working for the sides lasting. Heel seat lasting is realized by 21 tacks which can change in quantity and length (from 7 to 12 mm); three coaxial distributors allow to use simultaneously tacks of two different lengths.