Precision Rules : 10 Of The Best Finest Certified Chronometer Watches

Zenith Defy El Primero 21

Housing one of the most revered chronograph movements in the world of watchmaking, the El Primero has been Zenith’s pride and joy for five decades. This COSC-certified El Primero 9004 automatic movement—offering a minimum power reserve of 50 hours—can measure up to 1/100th of a second, and has an ‘exclusive dynamic signature of one rotation per second for the chronograph hand’. The movement runs at a frequency of 36,000vph, while a separate escapement for the chronograph feature vibrates at 3,60,000vph. All this certified chronometer timekeeping goodness is housed within a 44mm 18-karat rose gold case, water resistant to 100m, and fitted with a sapphire crystal caseback and domed sapphire crystal for the glass. The brown alligator leather strap has a black rubber lining underneath.

Chronometer

This COSC-certified El Primero 9004 automatic movement—offering a minimum power reserve of 50 hours—can measure up to 1/100th of a second, and has an ‘exclusive dynamic signature of one rotation per second for the chronograph hand’

Ulysse Nardin Marine Chronometer

Known for creating marine chronometers—which traditionally referred to a large timepieces meant to keep accurate time on-board a ship, despite the rocking of the vessel in choppy waters—Ulysse Nardin has a close connection with the marine world and with accurate timekeeping. These watches from the Marine Chronometer collection are powered by the automatic calibre UN-118, certified by the COSC, and also hold an Ulysse Nardin Performance Certificate.

The movement includes components made of Diamonsil, Ulysse Nardin’s revolutionary alloy that combines silicon with a synthetic diamond coating, which makes for ultralight parts that have no friction against each other, eliminating the need for lubrication and frequent servicing. The 60-hour power reserve offered by the movement is indicated at 12 o’clock, while at six is the small seconds sub-dial.

Set in a 43mm steel or gold case, the blue version is slightly larger at 45mm, and is water resistant to 200m, while the other two watches have 100m of water resistance. The gold watch, limited to 888 pieces, has more refined details, with sleeker Roman numeral hour markers, and slightly different sub-dials—all presented on a pristine white enamel dial. While the black dial watch come with a matching rubber strap, the blue and white dial models come with leather straps in blue and black respectively.

The Watch Guide

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