Grönefeld One Hertz Titanium Collection

Haute Horlogerie brand Grönefeld presents the “One Hertz Titanium” collection, comprising four remarkable models: One Hertz Fire, One Hertz Ice, One Hertz Classic and One Hertz Ruthenium. Each one features Grönefeld’s own ground-breaking 285-component, independent-dead-seconds movement – where the second hand advances in full steps – housed inside a high-tech, polished, grade 5 titanium case. introduced in 2010, the Grönefeld “One Hertz” was the  the world’s first and only production wristwatch with independent deadbeat seconds.

The latest collection consists of four different models: Four titanium cases, four stunning designs: The flame-orange dial of One Hertz Fire; dashing cool white of One Hertz Ice; and two stylishly traditional One Hertz Classic and One Hertz Ruthenium.

One Hertz Fire Titanium
With the One Hertz Fire, the One Hertz dial has been radiantly reinterpreted in a more casual/muscular layout, with flame-coloured touches that contrast against the dark grey background and blackened hand. The hour and minute subdial at 2 o’clock features an electrifying orange crosshair and number 12 and bright white chapter ring.

The raised seconds sapphire subdial – transparent over the hour and minute subdial – features metallised indices on a resplendent orange background, with a striking inner ensemble of white circles and arcs. In a scorching shade of orange, the power reserve indicator at 11 o’clock – now outside of the large seconds – and the setting-winding indicator at 3 o’clock look like two leaping sparks. The stark orange-on-black Grönefeld logo at 5 o’clock neatly complements the orange stitching on the hand-sewn matte black strap.

Specific features

  • Dial: Hour and minutes subdial with orange crosshair and number 12; raised seconds sapphire subdial (transparent over the hour and minute subdial) featuring metallised indexes with orange background; orange power reserve indicator; orange setting-winding indicator; Grönefeld logo and model name in orange on individual screwed down nameplates.
  • Hands: Hours and minutes, long thin counter-poised seconds, power-reserve and setting-winding.
  • Indications: Hours and minutes in subdial at 2 o’clock, Large seconds at 7 o’clock. Power reserve indicator at 11 o’clock. Setting-winding indicator at 3 o’clock.
  • Strap and buckle: Hand-sewn matte black, orange stitching, alligator leather with steel buckle engraved with Grönefeld logo

One Hertz Ice Titanium
One Hertz Ice sees the One Hertz dial dazzlingly reinterpreted in more casual/muscular layout with ice white and smooth silvery touches that show up superbly against the dark grey background and gold-toned hands. The hour and minute subdial at 2 o’clock now features a white crosshair and number 12 together with a silver-toned chapter ring.

The raised seconds sapphire subdial features metallised indices here on a pearly white background, with a striking silver inner ensemble of circles and arcs. The power reserve indicator at 11 o’clock – outside of the large seconds – and the setting-winding indicator at 3 o’clock are in fresh white. The dial is framed by a clean, white outer ring that merges into the grey-on-white Grönefeld logo at 5 o’clock.

Specific features

  • Dial: Hour and minutes subdial with white crosshair and number 12; raised seconds sapphire subdial (transparent over the hour and minute subdial) featuring metallised indexes with white background; white power reserve indicator; white setting-winding indicator; Grönefeld logo and model name in white on individual screwed down nameplates.
  • Hands: Hours and minutes, long thin counter-poised seconds, power-reserve and setting-winding.
  • Indications: Hours and minutes in subdial at 2 o’clock, large seconds at 7 o’clock, power reserve at 11 o’clock, setting-winding indicator at 3 o’clock.
  • Strap and buckle: Hand-sewn matte brown, alligator leather with steel buckle engraved with Grönefeld logo

One Hertz Titanium Classic
The One Hertz Classic indicates hours and minutes on a sub-dial at 2 o’clock and has a large subdial for the dead seconds at 7 o’clock; the innovative setting-winding indicator at 3 o’clock is counter-balanced by the power reserve indicator, placed at 12 o’clock on the hour-minute sub-dial – the classic One Hertz position for this complication. The ensemble of indicators is all the more striking thanks to the stylish, circular micro-guilloche beneath.

Specific features

  • Dial: Silvered base dial. Classic One Hertz Hour and minutes subdial; Classic One Hertz raised seconds sapphire subdial (transparent over the hour and minute subdial), Classic One Hertz power reserve indicator; Classic One Hertz 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.
  • Indications: Hours and minutes in subdial at 2 o’clock, large seconds at 7 o’clock, power reserve within large seconds, setting-winding indicator at 3 o’clock.
  • Strap and buckle: Hand-sewn matte black, alligator leather with steel buckle engraved with Grönefeld logo

One Hertz Ruthenium
The One Hertz Ruthenium indicates hours and minutes on a sub-dial at 2 o’clock and has a large subdial for the dead seconds at 7 o’clock; the innovative setting-winding indicator at 3 o’clock is counter- balanced by the power reserve indicator, placed at 12 o’clock on the hour-minute sub-dial – the classic One Hertz position for this complication. The ensemble of indicators on its almost black ruthenium dial is very stylish and sophisticated.

The One Hertz Ruthenium in a polished and brushed titanium case is a perfect combination for a beautiful and comfortable to wear dress watch.

Specific features

  • Dial: Dark ruthenium base dial. Classic One Hertz Hour and minutes subdial; Classic One Hertz raised seconds sapphire subdial (transparent over the hour and minute subdial), Classic One Hertz power reserve
    indicator; Classic One Hertz 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.
  • Indications: hours and minutes on a sub-dial at 2 o’clock. Large seconds at 7 o’clock; the innovative setting-winding indicator at 3 o’clock is counter-balanced by the power reserve indicator, placed at 12 o’clock on the hour-minute sub-dial
  • Strap and buckle: Hand-sewn matte black, alligator leather with steel buckle engraved with Grönefeld logo

The “One Hertz Titanium” collection comprising One Hertz Fire, One Hertz Ice, One Hertz Classic and Onze Hertz Ruthenium is available in four limited editions of 30 pieces each.

Common features
Case
Case crafted in grade 5 polished titanium made of 68 components, security screws, polished bezel and centre band with hand-finished straight graining.
Case dimensions: 43mm x 12.5mm
Engraving: “Titanium” and “Limited 30 pieces” and serial number
Sapphire crystals: Top domed with antireflective treatment both sides, display back with antireflective treatment inside.
Water resistance: 3atm/30m/100 feet.
Crown: Titanium with engraved “G” logo
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.

Movement
Calibre G-02, mechanical hand winding, independent dead seconds, power reserve Indicator and setting indicator.
Movement dimensions: 15 1/4’’’ 34mm x 9,5mm
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, gold excenters
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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