Grönefeld 1912 One Hertz, Steel

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This steel, Grönefeld 1912 One Hertz is one of the earliest wristwatches made by the brothers, after their Tourbillon Minute Repeater. Designed by the Grönefeld brothers in the Netherlands, the One Hertz movement was developed with the assistance of famed complications specialist Renaud and Papi in Switzerland, where Bart and Tim Grönefeld spent a number of years at the heart of the manufacture. Though subsequent pieces have since been made in a range of case materials, the One Hertz was initially launched in 2010, with a limited production of just 12 pieces in steel.