What type of watch feature swings over to display the moon shape in a pallet model?

The correct answer is the cover, which is a component of the watch that can be designed to slide or rotate to reveal the moon shape in a pallet model. This unique feature allows for a visual representation of the moon phases, enhancing the overall aesthetics and functionality of the watch. The cover serves as a protective element while also providing an interesting and interactive aspect that can be appreciated by the wearer.

In the context of watches, the cover is integral as it can add to the thematic design of the timepiece, such as displaying celestial events. This makes the watch not just a timekeeping instrument but also a tool for observing lunar phases, which some enthusiasts find particularly appealing.

Understanding how components like the cover work in conjunction with the dial plate, latch, and pivot can provide deeper insight into the functionality of watches and their intricate mechanisms, but in this specific case, the cover is what facilitates the display of the moon shape effectively.