9110.90.40.00 - Consisting of two or more pieces or parts fastened or joined together

This HTS category, 9110.90.40.00, specifically classifies watch and clock movements that are not yet fully assembled but are presented as two or more distinct components that are fastened or joined together. This implies a degree of pre-assembly where parts have been connected, but the complete functional unit of the movement is not yet formed. Examples could include a partially assembled escapement mechanism or a mainspring barrel that has been secured to its bridge, even if other components like gears or the balance wheel are yet to be integrated.

This classification is distinct from its sibling, 9110.90.60.00, which covers "Other" unassembled or partly assembled movements. While both relate to incomplete movements, 9110.90.40.00 is reserved for those where the constituent pieces have already been fastened or joined. The sibling category would encompass situations where parts are provided separately, without any prior fastening or joining, or for other scenarios of incomplete assembly not meeting the "fastened or joined" criteria.

As this is a leaf node, there are no further subcategories to introduce. The focus for classification under 9110.90.40.00 is therefore on identifying whether the components of an incomplete watch or clock movement have been physically connected or fastened together in any manner. The presence of such fastening or joining is the determining factor for inclusion in this specific sub-heading.