9111.90.70.00 - Other

This category, HTS 9111.90.70.00, encompasses "Other" parts for watch cases that do not fall under the more specific categories within heading 9111. These are components that are integral to the construction or functionality of a watch case but are not explicitly enumerated elsewhere in the subheading. Examples might include internal structural elements, certain types of seals, or decorative elements that are not classified as bezels, backs, or centers.

Distinguishing this category from its sibling, 9111.90.50.00 ("Bezels, backs and centers"), is crucial. While siblings are dedicated to specific, often externally visible or primary structural components, HTS 9111.90.70.00 serves as a residual category for all other case parts. Therefore, if a watch case part does not fit the definition of a bezel (the ring surrounding the crystal), a back (the rear cover), or a center (which can refer to the main body or chassis of the case), it is likely to be classified here.

As this is a leaf node, there are no further subcategories to introduce. The classification of goods under HTS 9111.90.70.00 relies on a careful examination of the physical characteristics, intended use, and material composition of the part in question, ensuring it is indeed a component of a watch case and not classifiable under a more specific provision or a different chapter of the Harmonized Tariff Schedule.