9109 - Clock movements, complete and assembled:

HTS Code 9109 encompasses complete and assembled clock movements. These are the internal mechanisms that power and regulate the timekeeping function of clocks. This category includes the intricate arrangements of gears, springs, escapements, and other components that collectively measure and display time, excluding finished clocks or watches.

Within Section XVIII of the Harmonized Tariff Schedule, Chapter 91 specifically addresses clocks and watches and their parts. While Chapter 91 also covers complete clocks and watches, HTS 9109 is distinct in that it focuses solely on the functional movement itself, prior to its incorporation into a clock case or its presentation as a finished timekeeping device. Therefore, if a product is a fully assembled clock or watch, it would be classified elsewhere in Chapter 91, not under 9109.

The subcategories within 9109 distinguish clock movements based on their primary power source. HTS 9109.10 covers electrically operated movements, which utilize electricity for power and regulation, often incorporating electronic components. HTS 9109.90, designated as "Other," encompasses all clock movements that are not electrically operated. This would primarily include mechanical movements powered by springs or weights, as well as other less common or hybrid power sources not fitting the "electrically operated" definition.