ZENITH Defy El Primero 21 44mm Watch Screw Down Crown The signature glide motion seconds 2 additional pockets The signature glide motion seconds hand of Spring Drive is in a gold color and captures the grandeur of the night sky as it sweeps silently across the wide dial Easily change your bracelet strap thanks to the Longines interchangeable system Its automatic movement features two independent high frequency escapements beating at 50Hz for the chronograph function and 5Hz for timekeeping The high frequency El Primero 21 1 100th chronograph crafted in a light yet rugged 44mm carbon fibre DEFY case with a black rubber strap