Zenith Defy Lab: World’s most accurate mechanical watch tells time in a whole new way

The makers of the Defy Lab say that, unlike a balance, the oscillator needs no lubrication, balancing, or calibration and is insensitive to temperature gradients, gravity, and magnetic fields. It beats at 15 Hertz with an amplitude of +/- 6 degrees (opposed to a conventional movement’s 300 degrees) providing an accuracy of within 0.3 seconds per day. For comparison, a chronometer certification requires an accuracy of 10 seconds per day.

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