91.10 ‑ Complete watch or clock movements, unassembled or partly assembled (movement sets); incomplete watch or clock movements, assembled; rough watch or clock movements.
Movement set (chablon) means a complete set of the components of a watch or clock movement, unassembled or partly assembled (marketed in this form). In the case of mechanical display movements, the dial and hands may or may not be included. Incomplete mechanical watch or clock movement means a movement which is mounted but lacks certain parts other than the dial, hands or winding spindle (e.g., the escapement or the barrel bridge). Incomplete fully electronic watch or clock movement means a movement which is mounted but lacks certain parts other than the battery (e.g., the display, part of the electronic circuit or components thereof). Incomplete electronic watch or clock movement with mechanical display means a movement which is mounted but lacks certain parts other than the dial, hands, setting spindle or battery (e.g., the electronic circuit or components thereof, the motor). Rough watch or clock movement means the unassembled parts of a watch or clock movement consisting of the plate (and any additional plates), bridges, train, motion work, winding and setting mechanism, and additional mechanisms such as automatic winding device, calendar mechanisms, chronograph, alarm, etc., but without escapement, balance‑wheel and hairspring or other regulating device, mainspring, dial or hands. These may be presented with or without a barrel.
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