GRONEFELD / The Horological Brothers
Key Highlights
- Gronefeld unveiled the 1941 Quadrivium at Watches and Wonders Geneva 2026, the record-breaking edition attended by 60,000 visitors
- Four in-house complications in a single watch: 7.5-seconds remontoire, one-minute flying tourbillon, central jumping seconds, and a 50-hour power reserve indicator
- Premiere Edition limited to 28 pieces in tantalum at €280,000; a subsequent platinum edition of 28 pieces is also planned at €310,000
- 40.0 mm diameter, 11.3 mm height; 473-movement components visible through a sapphire exhibition caseback
- Deliveries scheduled between late 2026 and early 2027
Gronefeld 1941 Quadrivium dial view showing the frosted main dial and one-minute flying tourbillon at 6 o’clock” />A New Pinnacle From the Horological Brothers
Bart and Tim Grönefeld have spent years fielding questions about their most celebrated discontinued references — the One Hertz, the Parallax Tourbillon, the Remontoire. Rather than reissue any one of them, the brothers made a bolder decision: bring all of their essential mechanical ideas together in a single, entirely new watch. The result is the Grönefeld 1941 Quadrivium, introduced to a select audience of collectors and press at the 2026 edition of Watches and Wonders in Geneva.
The name draws on classical scholarship. The Quadrivium was the higher division of medieval learning — arithmetic, geometry, music, and astronomy — four disciplines understood as an integrated whole. Here, it alludes to the four mechanical complications that define the watch. The brothers have already heard it described by those who saw it in Geneva as “Grönefeld’s Greatest Hits,” and the nickname fits.
Four Complications, One Movement
The Mechanical Architecture
The movement is built around serially connected concentric twin barrels, providing the energy foundation for a system of genuine horological ambition. A 7.5-seconds remontoire — visible as an exposed governor at 9 o’clock — regulates the force delivered to the escapement with exceptional consistency, isolating the tourbillon from the irregularities of a winding mainspring. The one-minute flying tourbillon sits raised in its cage at 6 o’clock, rotating without the upper bridge that typically frames such a complication, giving the dial an unobstructed view of the mechanism in motion.
A large central jumping seconds hand sweeps decisively across the dial, while a power reserve indicator at 10 o’clock communicates the remaining 50 hours of autonomy. Hours and minutes are displayed at 2 o’clock, keeping the time display clean and deliberate amid the mechanical theatre below. The movement counts 473 individual components — each one finished to the standard the Grönefeld atelier has maintained since its earliest references, including the 1969 DeltaWorks.
Dial and Case
The case follows the 1941 design language, a proportional vocabulary familiar from the Grönograaf, measuring 40.0 mm in diameter and just 11.3 mm in height. For the Premiere Edition, the case material is tantalum — a dense, dark, corrosion-resistant metal that gives the watch a distinctly understated authority on the wrist. The frosted main dial is complemented by hand-bevelled stainless steel elements and polished, multi-faceted white gold hour markers, with heat-blued steel hands completing the palette. A sapphire exhibition caseback reveals the elaborately finished movement in its entirety. (For full details, visit the official Gronefeld website.)
Edition Structure and Pricing
The Premiere Edition is strictly limited to 28 pieces in tantalum, priced at €280,000 excluding taxes. Once those deliveries are complete — scheduled between late 2026 and early 2027 — Grönefeld plans to follow with a second limited edition of 28 pieces in platinum at €310,000. The total production across both series will therefore not exceed 56 watches, placing the 1941 Quadrivium firmly in the territory of collector-grade rarities.
At Watches and Wonders Geneva, the watch was shown under strict embargo to a private group; the prototype had been completed just one day before the exhibition opened. No photography was permitted at that stage, and official imagery will be released at the end of 2026. Those wishing to express interest are invited to contact Bart and Tim directly at [email protected].
Why It Matters
For collectors in the GCC who track independent horology closely, the 1941 Quadrivium represents exactly the kind of watch that rarely reaches the open market: a fully in-house, multi-complication piece from a small atelier with a documented engineering heritage, produced in a quantity that guarantees genuine scarcity. With only 28 tantalum pieces available worldwide and deliveries beginning before 2027, those with serious intent would do well to reach out early.
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Frequently Asked Questions
What four complications does the Gronefeld 1941 Quadrivium combine?
The 1941 Quadrivium brings together a 7.5-seconds remontoire, a one-minute flying tourbillon, central jumping seconds, and a power reserve indicator — all within a single movement equipped with serially connected concentric twin barrels.
How many pieces of the Gronefeld 1941 Quadrivium will be made?
The Premiere Edition is limited to 28 pieces in tantalum. Following its delivery, a second limited edition of 28 pieces in platinum is also planned.
What is the price of the Gronefeld 1941 Quadrivium?
The 1941 Quadrivium is priced at €280,000 for the tantalum Premiere Edition and €310,000 for the platinum edition, both excluding taxes.
When will deliveries of the Gronefeld 1941 Quadrivium begin?
Deliveries of the Premiere Edition are scheduled to commence between late 2026 and early 2027.
Where is Gronefeld based and who are the founders?
Gronefeld is a Dutch independent watchmaking atelier founded by brothers Bart and Tim Grönefeld, who design and produce every timepiece in-house and are now joined by the fourth generation of the family.
