The Berkley Grand Complication — Inside the Most Complicated Watch Ever Made

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A record-breaking pocket watch uniting Chinese calendar mastery, chiming, astronomy, and mechanical ingenuity.

Its 63 Complications Set a World Record

It Introduced the First Chinese Perpetual Calendar

The Calendar Is Programmed Until 2200

Development Consumed 11 Years

Nearly 3,000 Components Work Together

It Weighs Almost One Kilogram

Both Chinese and Gregorian Calendars Appear

It Can Reproduce the Westminster Chime

Precision Goes Far Beyond Calendar Keeping

It Was Made for William R. Berkley

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Some watches are designed to disappear beneath a cuff. Others are created to test how much astronomy, mathematics, sound and mechanical engineering can coexist inside one object.

This exceptional piece belongs to the second category. Its record is impressive, but the real story lies in the unusual problems its makers solved to achieve it.

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