9105.99.40 - Having over one jewel

This HTS classification, 9105.99.40, specifically covers "Other clocks" that are not explicitly defined in preceding subheadings. Within this broader category, it further narrows down to "Other" clocks, and then to "Other" clocks designed to operate for over 47 hours without rewinding, and importantly, measuring not over 50 mm in width or diameter. The defining characteristic of this particular subheading is that these clocks are equipped with "over one jewel" in their movement. Jewels in clock movements serve as low-friction bearings for rotating parts, contributing to accuracy and longevity.

This category is distinguished from its sibling, 9105.99.30, by the presence of more than one jewel in the movement. While 9105.99.30 includes clocks with no jewels or only a single jewel, this subheading requires the presence of multiple jewels. This distinction is significant as the number of jewels can indicate a higher quality or more precise mechanism, influencing the value and intended use of the clock.

As this is a leaf node within the HTS structure, there are no further subcategories. Therefore, the classification is complete at this level, focusing on the specific attributes of the clock's movement, its power reserve, its physical dimensions, and the number of jewels it contains to determine its proper customs treatment.