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One Hertz
One Hertz 1912

Between 10000 CHF and 50000 CHF


Référence du produit


  • 1912
  • Limited edition of 12 watch(es)
  • Limited edition
Boîtier du produit


  • Material : Steel
  • Diameter : 43.00mm
  • Back : Sapphire
  • Water resistance : 30m
Mouvement du produit


  • Power reserve : 72h
  • Frequency : 21600 Alt/h
Bracelets du produit


  • Material : Leather
  • Buckle type : Pin buckle
Fonctions du produit


  • Hours
  • Minutes
  • Power reserve
  • Seconds

Introducing "One Hertz"

The world's first independent dead seconds series wristwatch

Dutch watchmakers Tim and Bart Grönefeld present  "One Hertz", the world's first and only production wristwatch with independent dead seconds (secondes morte in French). While rare, the dead seconds complication does exist; however to date they have been derived from other mechanisms, usually a constant force device or remontoir d'égalité.

The One Hertz features Grönefeld own proprietary movement and indicates hours and minutes on a sub-dial at 2 o'clock; large sub-dial for the dead seconds; power reserve indicator at 12 o'clock; and an innovative setting-winding indicator at 3 o'clock. Setting-winding is ergonomically selected by pushing the crown in rather than pulling it out.

Dead seconds - where the second hand advances in full steps of one second instead of an apparently smooth sweeping action - was a very respected mechanical complication until the 1980s; however, its popularity then died with the dominance of quartz movements, which also stepped in full seconds. A smooth sweeping second hand came to differentiate mechanical from quartz.

With their new One Hertz with its unique secondary gear train, Tim and Bart Grönefeld have resurrected this long neglected complication and re-positioned it where the complication 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 sublime flawless fine-finishing of the Grönefeld's own calibre G-02.

"One Hertz Dune" red gold, a limited edition of 20 pieces

"One Hertz 1912" steel, a limited edition of 12 pieces