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Power Reserve Indicator Mainspring from Japan

Extended mainspring barrel for watches with 7+ day power reserve indicators, powering complex mechanical movements. HTS 9114.90.38.00 includes such high-capacity 'other' springs as essential watch parts.

Duty Rate — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%

Import Tips

Torque specifications and winding tests documentation prove watch movement functionality

Distinguish from clock mainsprings (larger dimensions) that may classify under different clock headings

For precious metal versions, exact plating thickness determines chapter 71 vs. 91 classification