Zenith DEFY 21 44 mm Black Dial Ceramic Rubber Strap 49.9007.9004/11.R923

The high-frequency El Primero 21 1/100th chronograph in a 44mm black and white ceramic DEFY case, paired with a white and black textured rubber strap. Its automatic movement features two independent high-frequency escapements beating at 50Hz for the chronograph function and 5Hz for timekeeping.