The Dutch watchmakers Tim and Bart Gronefeld can trace their horological heritage all the way back to 1912, when Johan Gronefeld, their grandfather started his dazzling career.
Now, the acclaimed brand is proud to present its intriguing timepiece, the first ever equipped with deadbeat seconds. Launched in a limited edition of just 12 pieces, this watch has been appropriately called One Hertz 1912.
Herz is known to be the SI unit of frequency, defined as the number of cycles per second of a periodic phenomenon. Therefore, One Hertz implies “one cycle per second”. The year included into the model’s name pays tribute to Tim and Bart’s grandfather, who marked the beginning of the glorious Gronefeld dynasty.
A really complex construction, the deadbeat seconds complication represents a genuine feat when it is miniaturized to a wristwatch size. It brings to life the seconds hand, which jumps forward every second instead of gliding smoothly over the dial. This mechanism was rather popular until 1980s. Later on, it was relegated to the background, because of the dominance of quartz movements, which also advanced in full steps. By launching its innovative One Hertz watch, outfitted with its exclusive secondary gear train, Tim and Bart Gronefeld have breathed a new life into this undeservingly forgotten complication.
The brand’s newest creation relies on a mechanical manually-wound movement - Calibre G-02.
Composed of 254 parts, it features the dimensions of 35mm x 9.4mm. Decorating the movement are 39 jewels, mounted in gold chatons. It is equipped with a 9.12mm free-sprung Gyromax balance wheel, moving back and forth at 21,600 vibrations per hour.
Apart from the deadbeat seconds mechanism, the movement is outfitted with a power reserve indicator and a setting-winding indicator, presented at 12 and 3 o’clock respectively. The power reserve, provided by the movement, constitutes 60 hours. The setting-winding function is activated by pushing the stainless steel crown, engraved with "G" logo.
The basic functions of indicating hours and minutes are displayed on the counter, nestled at 2 o’clock. The deadbeat seconds, meanwhile, occupy the most part of the dial. The display also includes the Gronefeld logo as well as the model name, exposed on the individual screwed-down nameplates.
The appealing dial is housed in a stainless steel case, which boasts the dimensions of 43mm x 12.5 mm. It proudly reveals gold security screws, polished bezel and a centre band with hand-finished straight graining. On the dial side, the watch case is assembled with a domed sapphire crystal, treated with anti-glare coating on both sides. The case-back is equipped with the sapphire crystal with internal anti-reflective treatment. The water-resistance of this model is assured to 30 meters.
The remarkable Tim and Bart Gronefeld One Hertz watch is teamed with a hand-sewn matte black alligator leather strap, finished with a stainless steel engraved tang buckle.