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A richly illustrated, detailed account of wristwatch chronometers and the rigorous testing they must undergo to become certified. Over 400 photos document this crowning achievement of the watchmakers art while information about testing methods, procedures, and guidelines make it clear how great a challenge it has been. A compilation of participating makers based on Swiss Testing Agencies' yearly reports from 1925 and the Swiss Observatories' reports is included as is a guide to current values.