Since its birth in 1969, the Zenith El Primero movement has become the focus of many watch fans. The brand also derives different watches from it every year. In 2012, Zenith launched the El Primero Chronomaster Open Grande Date Moon & Sunphase and El Primero Chronomaster 1969. It is planned to be launched in 2012 in Basel. Officially appeared at the 2012 BadelWorld. El Primero Chronomaster Open Grande Date Moon & Sunphase (Large Date Window Sun Moon Phase Chronograph) is a watch that integrates various complex functions such as sun and moon phase display, hollow calendar, chronograph, etc., with a diameter of 45 mm 18K rose gold or stainless steel case, in addition to the subtle dial with hours, minutes and seconds, 9 o’clock also has a small seconds hollow dial, 2 o’clock is a large calendar window, 6 o’clock is decorated with practical and poetic day Moon phase display. The display function is demonstrated by two overlapping disks. The upper transparent disk inlaid with two polished metal moons rotates every 59 days, while the lower disk used to distinguish between day and night is Turn around in 24 hours. Equipped with 4047 chronograph movement, this movement accurately counts to 1/10 seconds. 50-hour power reserve. 50 meters waterproof. The El Primero Chronomaster 1969 chronograph uses a 42 mm stainless steel case. It follows the popular multi-color dial design of 1969. It uses dark blue and dark gray tones. The 30-minute lap at 3 o’clock and the 6 o’clock position. The 12-hour lap is no different from the El Primero chronograph that year. In addition to the minutes and hours and the time and minute display, the dial also has a hollow window at 9 to 11 o’clock. The silver relief design and three blue screws around the hollow window add beauty. In order to reflect the movement of the movement, the brand designer and watchmaker redesigned the movement, and moved the adjustment device and the function of vibrating ten times per second to the edge position of the movement at 10:00. In terms of power, the watch is equipped with the El Primero 4061 new automatic chronograph movement, which consists of 282 parts and has a 50-hour power reserve. 100 meters waterproof.