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Omega says that this allows the LdP to take more accurate measurements during the 15 days of chronometer testing according to the ISO 3159 standard. This standard outlines the positions, temperatures, and conditions a watch must undergo to meet chronometer standards according to ISO. The 15-day testing period is link specifically for wristwatches (if you care, link carriage clocks get measured over 19 days and link quartz watches over 13 days).
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