9102.91 - Electrically operated:

This HTS category, 9102.91, specifically encompasses electrically operated watches, excluding those classified under heading 9101 (which are typically precious metal or plated precious metal watches). It serves as a catch-all for electrically powered wristwatches, pocket watches, and other types of watches that do not fall into more specific subheadings within heading 9102. The defining characteristic for inclusion here is their electrical operation, distinguishing them from mechanical timepieces.

The sibling category, 9102.99, also falls under "Other" electrically operated watches. However, the distinction between 9102.91 and 9102.99 lies in the presence of an opto-electronic display. This node (9102.91) is reserved for electrically operated watches that *do not* exclusively feature an opto-electronic display, meaning they might utilize analog displays, digital displays not solely relying on opto-electronic technology, or a combination thereof.

Within this category, further distinctions are made through subcategories. The presence of subcategory 9102.91.20, "With opto-electronic display only," indicates that this parent node primarily captures those electrically operated watches that *do not* fit that specific display type. The subsequent "Other" subcategory likely accounts for the remaining variations of electrically operated watches that are not exclusively opto-electronic and do not fall into other more specific classifications.