Grönefeld One Hertz Platinum Limited Edition

Grönefeld One Hertz – the world’s first series wristwatch featuring independent dead seconds – was awarded Timezone’s Watch of the Year 2011. This watch was launched initially in 2010 as the One Hertz 1912 version. The One Hertz Red Dune version joined in 2011.

This year, the Netherlands based Grönefeld Exclusive Timepieces brand will be introducing their new One Hertz line featuring exclusive platinum case and sophisticated blue dial.

Gronefeld One Hertz Platinum Limited Edition watch

The One Hertz Platinum features Grönefeld’s own proprietary movement of which all 285 parts are hand-decorated to the highest standards.

The One Hertz indicates hours and minutes on a sub-dial at 2 o’clock; large sub-dial for the dead seconds; power reserve indicator at 12 o’clock; and an innovative setting-winding indicator at 3 o’clock. This ensemble of indicators is all the more striking thanks to the sophisticated blue dial background, which perfectly complements the regal tones of the precious metal platinum case.

The One Hertz Platinum’s setting and winding is also extremely ergonomic, selected by pushing the crown in, rather than pulling it out.

Grönefeld One Hertz Platinum Limited Edition watch

Dead seconds – where the second hand advances in full steps of one second instead of an apparently smooth sweeping action – was a very respected mechanical complication until the 1980s. However, its popularity then died with the dominance of quartz movements, which also stepped in full seconds. A smooth sweeping second hand came to differentiate mechanical from quartz.

With the One Hertz and its unique secondary gear train, Tim and Bart Grönefeld have resurrected this long-neglected complication and re-positioned it where the complication originated: On the pedestal of high precision.

The quartz-like movement of the large second hand of the One Hertz subtly signals its unique mechanism, invisible to most, but obvious to haute horlogerie connoisseurs, who will appreciate the sublime, flawless fine-finishing of the Grönefelds’ own calibre G-02.

The One Hertz Platinum, with exclusive platinum case and sophisticated blue dial, will be unveiled at Baselworld 2012 (Hall 5.1 booth C.01). The “One Hertz Platinum” is a limited edition of 12 pieces.

Technical details

Model: Grönefeld One Hertz Platinum Limited Edition

Indications: Hours and minutes in subdial at 2 o’clock, large seconds at 7 o’clock, power reserve, setting-winding indicator at 3 o’clock.

Winding-Setting mechanism: Push function crown for winding or setting.
Power reserve mechanism: Classic Breguet style by means of a cone moving up and down on the threaded barrel arbour.

Case and dial
Case crafted in platinum, security screws, polished bezel and centre band with hand-finished straight graining.
Case dimensions: 43 mm x 12.5 mm
Sapphire crystals: Top domed with antireflective treatment both sides, display back with antireflective treatment inside.
Water resistance: 3atm/30m/100 feet.
Crown: With engraved “G” logo
Dial: Hour and minutes subdial, raised seconds sapphire subdial (transparent over the hour and minute subdial), power reserve indicator, setting-winding indicator, Grönefeld logo and model name on individual screwed down nameplates
Hands: Hours and minutes, long thin counter-poised seconds, power-reserve and setting-winding.
Strap and buckle: Hand-sewn matte black, alligator leather with platinum folding buckle

Calibre: G-02, mechanical hand winding, independent dead seconds, power reserve Indicator and setting indicator.
Movement dimensions: 35mm x 9.4 mm
No. of parts: 285 parts
No. of jewels: 39 jewels set in gold chatons
Power reserve: 72 hours
Barrels: 2 barrels, one for the going gear train and one for the independent dead seconds mechanism. Both barrels are wound at the same speed and in the same direction
Balance wheel: 9.12 mm free sprung variable inertia balance wheel
Balance frequency: 21’600 bph/ 3 Hz
Balance spring: Phillips terminal overcoil curve, triangle-style stud
Main Plate: Spotted rhodium plated nickel silver
Bridges: Stainless steel hand bevelled, micro-blasted, circular grain on the top, relief engraved on micro blasted surface
Gearing: 2 independent gear trains each with their own energy source
Dead seconds mechanism: Independent mechanism, cam with 30 teeth on the going gear train on the second’s wheel, escape wheel on the seconds wheel of the independent gear train, double lever with jewelled pallets.

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