Differences Between Full-Power and Reduced-Power Versions of the 413x Series
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Full-power versions (4130 & 4131): 70-hour power reserve; bidirectional automatic winding; internal model number ST-4510 (DanDong Movement Factory). Reduced-power versions (4130 & 4131): 55-hour power reserve; unidirectional automatic winding; internal model numbers ST-4801 (standard) and ST-4802 (skeletonized), both from DanDong Movement Factory. Shanghai-made 4130 and 4131 movements are available exclusively in full-power configuration. To verify the version, simply open the case back — the distinction is immediately apparent.
