As a partner of the tt motorcycle race on the isle of man graham produces special commemorative watches the silverstone tourist trophy isle of man is a limited edition watch solely 200 pieces have been produced the movement is automatic bi compax chronograph g1734 it performs 28 800 vibrations per hour additional features include incabloc shock absorber a 48 hour power reserve and 27 jewels this timepiece comes with a number of complications among which a chronograph having seconds and