Monochrome Watches
An online magazine dedicated to fine watches

The Grönefeld 1941 Grönograaf, the Horological Brothers’ First Chronograph

A classic chronograph movement, an option for a tantalum case, and the usual superb execution of the watchmakers from Oldenzaal, NL.

| By Brice Goulard | 5 min read |
Gronefeld 1941 Gronograaf - first chronograph Horological Brothers

The Horological Brothers, Tim and Bart Grönefeld need little to no introduction – at least if you’re into independent watchmaking. Amongst the most talented watchmakers of their generation, and often regarded as the top-end of the watchmaking scene in the Netherlands, the Brothers are continuing their direction in design and movement construction, starting with the Grönefeld 1941 Remontoire of 2016. This delightful constant force watch was followed by the simpler, more focused and automatic Grönefeld 1941 Principia, and recently the discreetly released Decennium Tourbillon. And today, with the same design principles, the brand releases its first-ever chronograph, the Grönefeld 1941 Grönograaf. And yes, the movement is still a true feast for the eye.

Throughout their career, the Horological Brothers Bart and Tim have produced a variety of unique mechanisms including a tourbillon minute repeater, a jumping seconds and a flying tourbillon with hacking seconds. Yet, the chronograph is one of the rare complications they’ve never touched. Keep in mind that a chronograph is, with a minute repeater, one of the most complex mechanisms to develop and construct. The Brothers needed a bit of time to conceive this watch, but indeed, here it is: the 1941 Grönograaf.

Gronefeld 1941 Gronograaf - first chronograph Horological Brothers

Ad – Scroll to continue with article

Visually, the 1941 Grönograaf is unmistakably part of the 1941 family, sharing the same case design and an identical style for the dial… With more complexity, being more loaded when it comes to the indications. As such, the Grönograaf (a contraction of Grönefeld and Chronograaf, the Dutch word for chronograph) comes in the smooth and elegant 1941 case, with entirely polished surfaces and complex lugs, with a signature recessed part inside. The watch measures a very restrained 40mm diameter, and the case is a mere 11.3mm in height – which are about perfect proportions if you ask me.

Gronefeld 1941 Gronograaf - first chronograph Horological Brothers

The rest of the case has been adapted to meet chronograph requirements, meaning that next to the classic crown of the collection, you’ll find two rectangular pushers. The watch is presented in two editions, only differing regarding the material of the case, which can be stainless steel or tantalum – the edition that will certainly be the most coveted. The strap you see in the images here is just an illustration, and you can choose practically everything to suit your tastes – you can see examples on this page.

Gronefeld 1941 Gronograaf - first chronograph Horological Brothers

The dial is typical Grönefeld, playing on levels, textures and sense of depth. In this instance, it is reminiscent of the Brothers’ earliest creations, the One Hertz and the Parallax Tourbillon. The base of the dial is frosted and satin-grained stainless steel, with raised indications read over rhodium-plated sub-dials and elements. All the functions are indicated by lancette or Breguet hands in flame-blued steel with mirror-polished centres, as well as faceted trapezoidal indexes. The display consists of an off-centred hours/minutes dial at 1 o’clock, a small seconds at 9 o’clock, a power reserve at 11 o’clock, a central chronograph seconds hand and a 30-minute counter at 6 o’clock. And there’s something special at 4 o’clock… More on that in a bit.

Gronefeld 1941 Gronograaf - first chronograph Horological Brothers

Let’s turn the Grönefeld 1941 Grönograaf over… and here is the true gem: the new calibre G-04, designed, manufactured, finished and assembled by the Brothers and their team, in Oldenzaal, the Netherlands. The movement has been conceived as a typical Gronie’s take on the classic chronograph, meaning hand-wound, column-wheel and lateral coupling architecture – something Valjoux 72 and Lemania fans will certainly appreciate. It has been improved technically over older architectures and comprises no fewer than 408 parts.

Gronefeld 1941 Gronograaf - first chronograph Horological Brothers

As the brand explains, “chronograph movements are often subject to harsh forces that can sometimes scar hammers and bend hands,” when the start-stop-reset sequence is actuated. To address the issue, “The Horological Brothers conceived a less aggressive system, a ‘soft reset’ mechanism. A centrifugal governor, positioned at 4 o’clock, typically seen on minute repeaters, slows down the reset function, thereby proving kinder to components while delivering a fascinating spectacle in the process. The governor includes two solid gold weights.” Also, “depending on the position of the heart-shaped cams for the counter hands, the relevant minutes and seconds hands rotate clockwise or counterclockwise, heightening the sense of mechanical theatre.” Finally, the 30-minute counter, located at 6 o’clock, features an instantaneous jumping minutes.

Gronefeld 1941 Gronograaf - first chronograph Horological Brothers

To ensure smoothness and reliability, the 1941 Grönograaf features ruby jewelled hammers to lessen the impact when returning to zero. And the keyless works feature a conical winding pinion and crown wheel, delivering a smooth winding action. As for the rest of the movement we’re talking about has classic hand-wound architecture with a variable-inertia balance wheel with timing screws and a free-sprung balance spring with a Phillips terminal overcoil curve, beating at a frequency of 3Hz. The barrel delivers 53 hours of power reserve.

Gronefeld 1941 Gronograaf - first chronograph Horological Brothers

As always with Bart and Tim, the decoration of the Grönefeld 1941 Grönograaf is exceptional. The mainplate is embellished with spotting, while the bridges are formed of stainless steel, polished by hand. Moreover, the bridges have micro-blasted centres, circular graining on the top and feature various engravings in relief. The heart-shaped cams, the elongated chronograph bridge, the gold chatons and the screw-heads are embellished with black polishing, performed in the traditional way using diamond paste on a tin plate. And the design is, as usual, ultra-complex, aerial, technical and modern while respecting the codes of Haute Horlogerie.

Availability & Price

The Grönefeld 1941 Grönograaf will be released in two limited editions of 188 pieces in stainless steel and 25 pieces in tantalum. The price will be EUR 155,000 in steel and EUR 165,000 in tantalum. For more details and to place a reservation, please visit

3 responses

  1. Where can a person wear a watch like this is Europe without getting robbed?

  2. Hastiado de un modo de contar el tiempo muy usado y abusado. Todos estos cronógrafos son bastante poco utiles, ya que todos tienen contadores de 30 minutos, lo cual es francamente limitado. (El clásico huevo hervido, las pastas, etc.)
    Creo que el cronógrafo mecánico ideal debe tener un contador de minutos que complete una revolución cada hora porque así es literalmente como todo el mundo está acostumbrado a leer un dial de minutos, también debe tener un contador de horas. Nada de 30 minutitos que se quedan muy cortos para el modo bulbo de mi otro hobby.
    Pero, lamentablemente, algo asi, no es el estandar de la industria hoy en dia ni nunca lo ha sido, por eso flipo cuando veo el ingenio desplegado en aparatos como el Sinn EZM 1.1 S, un cronógrafo para zurdos muy luminoso. Obviamente la gran mayoria de entusiastas de los relojes solo compran cronógrafos para lucir su estética pero no los usan. Si lo hicieran, la subesfera de 30 minutos sería una rareza y no la oferta predeterminada que siempre ha sido. En este caso la sección cronógrafo es solo un pretexto para lucir calibre, acabados y alta relojeria a pulso contra dinero abundanteeeee.


Leave a Reply