Zenith is a luxury watch brand founded in 1865 in Le Locle, Switzerland.
Zenith has a major design feature called "openwork". By hollowing out a portion of the dial to expose the heart of the movement, the watch is popular for its uniqueness that allows the viewer to enjoy the complex structure of the mechanical movement and how it works mechanically. You can find similar designs in many brands today, but Zenith is a trend-setting pioneer.