The Grönefeld brothers’ upbringing in a small town in the eastern part of the Netherlands was steeped in horology. In the evenings and on the weekends, as children, they used to play in their grandfather Johan's workshop, surrounded by instruments and by the sound of their ceaseless ticking. As a gifted watchmaker, Johan also looked after the clock of the nearby church, dating back to 1240. On his death, this custodianship was passed onto his son, the Grönefeld brothers’ father. The latter's year of birth was commemorated in the reference of the '1941 Remontoire'.

Watchmaking having made a strong imprint on them in their respective youths , Bart and Tim Grönefeld both trained in horology, cutting their teeth at famed complications specialist Renaud et Papi, alongside notable contemporaries such as Stephen Forsey and Stepan Sarpaneva. Producing no more than 70 watches a year, the Grönefeld brothers create extremely high-quality pieces, having commanded the admiration and respect of none other than M. Philippe Dufour, amongst others.