9108.90 - Other:

This HTS category, 9108.90, encompasses watch movements that are complete and assembled, but do not fall under more specific classifications within heading 9108. Essentially, it serves as a residual category for such movements. This means it includes watch movements that are not electrically operated and are not solely characterized by having automatic winding mechanisms. The defining feature is that these are the internal mechanisms responsible for powering and regulating a watch's timekeeping functions, fully assembled and ready for incorporation into a watch case.

This category is distinct from its siblings by its explicit exclusion of electrically powered movements and those with automatic winding. For instance, if a watch movement utilizes battery power or incorporates an automatic rotor to wind itself, it would be classified under a different, more specific subheading. The "Other" designation here is crucial, indicating that classification into 9108.90 should only occur after all other more precise subheadings within heading 9108 have been considered and found inapplicable.

The subcategories under 9108.90 further refine classification based on the presence and number of jewels used in the movement. Jewels, typically synthetic rubies or sapphires, are incorporated at critical pivot points within a watch movement to reduce friction and wear, thereby enhancing accuracy and longevity. The subdivisions are structured to distinguish movements based on whether they contain no jewels, only one jewel, a range of over one to seventeen jewels, or more than seventeen jewels. This granular breakdown allows for precise identification and appropriate duty assessment based on the complexity and quality of the watch movement.