Opto-electronic display watch movements — those showing time exclusively via LED, LCD, or similar electro-optical means rather than hands or mechanical indicators — are classified under a single 10-digit line (9108120000) within this heading. The distinction from heading 910811 (mechanical display) and 910819 (other display types) is the display technology: if the movement can accommodate a mechanical display in addition to an opto-electronic one, it falls outside this provision. Importers of digital-display watch modules should verify that the movement is designed solely for opto-electronic output before applying this classification.

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