Product classification
HS code for Self-winding watch movements: 9108.20
Watch movements, complete and assembled, with automatic winding.
Classification of self-winding watch movements under HS 9108.20
Self-winding watch movements, also known as automatic movements, are classified under Chapter 91 of the Harmonized System, which covers clocks and watches and parts thereof. Specifically, they fall under Heading 9108, which is reserved for watch movements that are complete and assembled. Subheading 9108.20 is the specific designation for movements with automatic winding. The classification is determined by the mechanical nature of the movement and the presence of a self-winding mechanism, typically involving an oscillating weight or rotor that winds the mainspring through the motion of the wearer's wrist. According to the Chapter Notes for Chapter 91, "watch movements" are devices regulated by a balance wheel and hairspring, quartz crystal, or any other system capable of determining intervals of time, with a display or a system to which a mechanical display can be incorporated. They must also be of a thickness not exceeding 12 mm and a width, length, or diameter not exceeding 50 mm. Self-winding movements are distinguished from manual-wind movements by their ability to store energy without manual intervention.
- Covers
- Complete assembled automatic mechanical watch movements
- Self-winding calibers with date or chronograph complications
- Automatic movements for wristwatches
- Rotor-based mechanical movements
- Also under 9108.20
- ETA 2824-2 Movement
- Miyota 9015 Movement
- Seiko NH35 Movement
- Sellita SW200-1 Movement
- Rolex Caliber 3235 Movement
Codes often confused with 9108.20
Common mistake. These movements are often misclassified under 9108.11, which is for battery-powered or electrically operated movements with mechanical displays. They may also be confused with 9108.90, which covers "other" watch movements, including manual-wind versions. Additionally, if the movement is not complete or not assembled, it must be classified under Heading 9110. It is also important to distinguish them from clock movements (Heading 9109) based on the size and thickness dimensions specified in the chapter notes.
Top exporters and importers of HS 910820 (the code used for self-winding watch movements), 2025
In 2025, the largest exporter of HS 910820 (the code used for self-winding watch movements) in UN Comtrade data was Switzerland, with 31% of world exports; the largest importer in UN Comtrade data was China, with 18% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Figures cover everything classified under HS 910820, not only self-winding watch movements.
Top exporters 2025 · share of world exports
- 1 Switzerland $103M 31% of world exports
- 2 Japan $69M 21% of world exports
- 3 Malaysia $58M 17% of world exports
World total: $335M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 China $39M 18% of world imports
- 2 Hong Kong $27M 12% of world imports
- 3 Switzerland $26M 12% of world imports
World total: $216M Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM code for self-winding watch movements
Brazil classifies self-winding watch movements under NCM 9108.20.00: HS 9108.20 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about self-winding watch movements
What is the HS code for Self-winding watch movements?
The HS code for Self-winding watch movements is 910820 (Watch movements; complete and assembled, with automatic winding). The HS code for complete and assembled self-winding watch movements is 9108.20.
How do I classify Self-winding watch movements for customs?
Self-winding watch movements is classified under HS code 910820 — Watch movements; complete and assembled, with automatic winding. This is a 6-digit subheading level code.
What if the automatic movement is imported inside a watch case?
If the movement is already inside a case, the entire item is classified as a watch under Heading 9101 or 9102, not as a movement.
Which countries are the top exporters of self-winding watch movements (HS 910820)?
In 2025, the top exporters of HS 910820 (the code used for self-winding watch movements) in UN Comtrade data were Switzerland ($103M, 31% of world exports), Japan ($69M) and Malaysia ($58M). World exports came to about $335M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of self-winding watch movements (HS 910820)?
In 2025, the top importers of HS 910820 (the code used for self-winding watch movements) in UN Comtrade data were China ($39M, 18% of world imports), Hong Kong ($27M) and Switzerland ($26M). World imports came to about $216M, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Is the HS code for Self-winding watch movements the same in all countries?
The base HS code 910820 for Self-winding watch movements is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for self-winding watch movements in Brazil?
In Brazil, self-winding watch movements (HS 910820) is classified under NCM 9108.20.00.