one hertz by grönefeld timepieces
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ONE HERTZby
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It is the
and its
watchm
This m
Grnef
brothe
buildin
unbrok
anywh
Both T
Switze
adept w
horolog
Worki
for man
GrnefeExThe name Grnefeld and the art of
watchmaking have a family history
spanning nearly one hundred years,
originating in the small and ancient town
of Oldenzaal located in The Netherlands.
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Large sapphire dial to enhance the dead seconds
Seconds dial is raised and fixed to three pillars
Hours and minutes on a sub-dial at 2 oclock
Power reserve indicator at 12 oclock
Setting-winding indicator at 3 oclock
Setting-winding is ergonomically selectedby pushing the crown instead of pulling it out
Designof the dial
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ONE HERTZ
DUNE
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ONE HERTZ
1912
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Mechanical hand-wound movement
Independent Deadbeat Seconds
Power-Reserve Indicator
Setting Mechanism Indicator
Technical specificationsOne Hertz
Caliber G-02
Movement dimensions Diameter: 15 1/4 34 mmThickness: 9.5 mm
Number of parts Complete movement: 285 parts
Number of jewels 39 jewels in gold chatons
Power reserve 72 hours
Barrels 2 barrels, one for the going geartrain and one forthe independent deadbeat seconds mechanismBoth Barrels are wound at the same speed and inthe same direction
Balance wheel Free sprung variable inertia balance wheel(9.12 mm diameter)
Frequency 21600 vibrations/hour
Balance spring Phillips terminal overcoil curveTriangle-style stud
Escapement Swiss lever escapement
Main Plate Spotted and snailed rhodium plated nickel silver
Bridges Hand beveled. Stainless steel X40 Cr13Micro-blasted centreCircular grain on the topRelief engraved in the micro blasted surface
Gearing Two geartrains with their own energy sources(2 barrels)
Deadbe
Windin
Power
Display
Casing
Numbe
Case
Case di
Water
Crown
Dial
Hands
Strap