Watch
Parts

The movement and case are the basic parts of a watch. A watch band or bracelet is added to form a wristwatch; alternatively, a watch chain is added to form a pocket watch.

The case is the outer covering of the watch.

The case back is the back portion of the watch's case. Accessing the movement (such as during battery replacement) depends on the type of case back, which are generally categorized into four types:

The crystal, also called the window or watch glass, is the transparent part of the case that allows viewing the hands and the dial of the movement.Modern wristwatches almost always use one of 4 materials:

The bezel is the ring holding the crystal in place.

The lugs are small metal projections at both ends of the wristwatch case where the watch band attaches to the watch case. The case and the lugs are often machined from one solid piece of stainless steel.
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