One Hertz

  • description

    The Grönefeld One Hertz features a completely original in-house developed movement indicating hours and minutes on a sub-dial at 2 o'clock, a large sub-dial for the deadbeat seconds filling the majority of the dial with a power reserve indicator at 12 o'clock, and a setting-winding indicator at 3 o'clock. Setting-winding is ergonomically selected by pushing the crown instead of pulling it out.

    With the One Hertz's unique secondary gear train, Tim and Bart Grönefeld have re-positioned the deadbeat seconds complication where it originated, i.e. 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 aficionados who will appreciate the flawless fine-finishing of the in-house developed calibre G-02.

    The One Hertz launched in 2010 with a subscription-only limited edition of 12 pieces in steel called the "One Hertz 1912" – 1912 was the year Tim and Bart's grandfather qualified as a watchmaker. 2011 heralded the One Hertz Dune, a limited edition of 20 pieces in red gold.


  • technical specifications

    Calibre G-02, mechanical hand winding, independent deadbeat seconds, power reserve indicator and setting indicator

    Movement
    Number of parts:  285
    No.of jewels:   39, set in gold chatons
    Power reserve: 72 hours
    Balance wheel:   9.12mm free-sprung  variable inertia balance wheel
    Frequency: 21’600 bph/3 Hz
    Balance spring:   Phillips terminal overcoil curve                               
    Deadbeat seconds mechanism: Independent mechanism, cam with 30 teeth on the going gear train on the seconds wheel, escape wheel on the seconds wheel of the independent gear train
                                       
    Case and dial
    Material:   stainless steel, limited edition of 12 pieces, gold security screws            
    Dimensions: 43mm x 13mm  
    Water resistance:    3atm/ 30m/ 100feet
    Dial:   Hour and minutes sub-dial, seconds sub-dial, power reserve indicator, setting-winding indicator
    Hands:  Hours and minutes, long thin counter-poised seconds, power reserve and setting-winding
    Strap  and buckle:   : Hand-sewn matte black, alligator leather with stainless steel engraved tang buckle

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