Seiko Moon Phase Half Moon Quartz 35MM

A Moon Phase Watch is a special watch that has the function of displaying the changes in the moon phases. It is a combination of engineers and designers to accurately present the various stages of the moon in the sky. Moon phase watches usually have a small round window on the dial with a moon pattern inside. Through a special mechanical device on the dial, the moon phase watch can accurately display the current moon phase, such as new moon, first quarter moon, full moon and last quarter moon. This is achieved by combining the movement with a special gear system.