The Grönefeld One Hertz is the second complicated mechanical timepiece created by Swiss trained, Netherland based watchmaking brothers, Bart and Tim Grönefeld. The movement for this new timepiece, was created completely in-house. The dial indicates hours and minutes on a sub-dial at 2 o'clock. Power reserve is indicated at 12 o'clock. But what really makes this timepiece standout, is the deadbeat seconds, which is indicated by the large off-centre sub-dial. Independent deadbeat seconds, rotate the dial (independent means the seconds are displayed in the sub-dial) by ticking forward, much like on a traditional quartz movement. Except that this is, of course, a mechanical movement, which really makes it complicated to produce. In fact, this is the world's first and only mechanical timepiece with independent deadbeat seconds.
Press Release
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 launches 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.
History
The name Grönefeld 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. It is there, in a shop directly under the view of the ancient basilica church and its tower dating from 1240, that the grandfather of the present watchmakers, Johan Grönefeld, began his career as a watchmaker in 1912.
| This marked the beginning of the small and highly talented dynasty of Grönefeld watchmakers, which reaches to the present day with the brothers Bart and Tim Grönefeld.Their workshop is located in the same building as that used by Johan Grönefeld, representing a continuous, |
Both Tim and Bart Grönefeld underwent extensive training in Switzerland, and within a relatively short span of time proved themselves adept world specialists in the production of the most coveted and exquisite horological compications of all: the tourbillon and the minute repeater wristwatch. in 2008, after working anonymously behind the scenes for prestigious Swiss brands, they presented the first watch bearing their own name, the GTM-06 Tourbillon Minute Repeater.
GTM-06
description
The GTM-06 minute repeater differs from other repeater wristwatches in a number of details. There is an acoustic reason for the large case design, as the generous case volume allows the gongs to develop a full and pure sound. The GTM-06 utilises a Cathedral gong that circles the inside of the case twice - the majority of minute repeaters have a shorter gong making just one circumference of the case - providing the fullest possible tone achievable.
The lugs are specially channeled in order to allow the resonance of the case not to be dampened by their mass. The chapter ring of black onyx is adorned with highly polished hour indexes that catch the light at every angle. It takes takes more than two months of intensive work in several stages just to complete the fine finishing of the components before assembly even begins.
Available with either a 18k 4N rose gold case or a 950 platinum case.
technical specifications
Mechanical hand wound movement, Caliber G-01, one-minute tourbillon, minute repeater. Limited edition of 10 in platinum, 10 in pink gold
Movement
Number of parts: 385
No.of jewels: 41
Power reserve: 48 hours
Balance wheel: Glucydur with timing screws, 11 mm diameter
Frequency: 18’000 bph/2.5 Hz
Balance spring: Breguet overcoil
Tourbillon: One minute Tourbillon, weight of cage 0.420 grams,
Repeater : Classical mechanism visible through display back, Cathedral gongs
Case and dial
Material: 4N pink gold or 950 platinum, limited edition of 10 pieces each
Lugs: Special channeled lugs to improve the sound of the minute repeater
Dimensions: 44mm x 15mm
Water resistance: 2atm/ 20m/ 60feet
Dial: Open hour- minutes chapter ring made of natural black onyx,
Hands: Hour and minute in pink gold or white gold with black nickel plating
Strap and buckle: Hand-sewn mat black, alligator leather with rose- or white gold triple folding buckle
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