Tim and Bart Grönefeld are third-generation watchmakers; their grandfather Johan Grönefeld opened a watchmaker's shop in Oldenzaal, in the eastern Netherlands, in 1912. Tim trained at Audemars Piguet's Renaud & Papi (APRP) laboratory in Le Locle, while Bart spent formative years at Philippe Dufour's atelier in the Vallée de Joux and at Asprey restoring complicated pocket watches. The brothers joined forces and founded their own brand in the family workshop in 2008.
The early references (One Hertz in 2011, Parallax Tourbillon in 2014) established Grönefeld's design vocabulary: arched steel bridges echoing Dutch church architecture, deeply polished anglage, and an understated case shape that draws on vintage dress-watch proportions. In 2015 the 1941 Remontoire introduced an 8-second constant-force mechanism with a visible spring on the rear, and in 2016 the 1941 Remontoire won the Men's Watch Prize at the Geneva Watchmaking Grand Prix, the brand's biggest international accolade.
The collection today is built around the 1941 Remontoire, the 1941 Principia (a time-only piece with Grönefeld's stepped architecture), the 1941 Grönograaf (the brothers' first chronograph, 2022, with a reset-to-zero mechanism driven by a heart-cam unique to the house), and the Decennium 10th-anniversary tourbillon. Pricing ranges from ~€53,000 for a Principia to €160,000+ for the Grönograaf and over €250,000 for the tourbillon references. Annual production stays at roughly 40 pieces; the atelier remains a family workshop, with Tim leading movement design and Bart leading finishing and assembly.
