One Hertz Dune by Grönefeld
The reinvention of mechanical dead seconds
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Now rare, the dead seconds complication – secondes mortes in French –traditionally denoted precision clocks, in a era where most clock were not accurate enough to measure seconds.
Limited edition of 30 pieces
Technical Specifications for the One Hertz Titanium collection
The “One Hertz Titanium” collection is available in four limited editions of 30 pieces each: The One Hertz Fire, the One Hertz Ice, One Hertz Classic and the One Hertz Ruthenium.
One Hertz Fire and One Hertz Ice 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.
. One Hertz Classic 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.
. 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 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
Hands: Hours and minutes, long thin counter-poised seconds, power-reserve and setting-winding.
One Hertz Fire strap and buckle: Hand-sewn matte black, orange stitching, alligator leather with steel buckle engraved with Grönefeld logo
One Hertz Ice strap and buckle: Hand-sewn matte brown, alligator leather with steel buckle engraved with Grönefeld logo
One Hertz Classic strap and buckle: Hand-sewn matte black, alligator leather with steel buckle engraved with Grönefeld logo
One Hertz Ruthenium strap and buckle: Hand-sewn matte black, alligator leather with steel buckle engraved with Grönefeld logo
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.