A modern technical showcase within Zenith's Defy line, this Defy El Primero 21 pairs a 44mm black ceramic case with a skeleton dial that puts its architecture front and center. The monochrome treatment gives the watch a sharp, contemporary edge, while the openworked display keeps the chronograph registers and power reserve integrated into the design. An automatic movement drives the chronograph and power reserve indications. At 14.5mm thick, it wears with the broad, angular stance collectors expect from the Defy.