Grönefeld 1941 Decennium Tourbillon

Baselworld 2019: Grönefeld 1941 Decennium Tourbillon

Reading Time: 4 minutes

Grönefeld 1941 Decennium Tourbillon is the 10 years anniversary piece from the Dutch Horological Brothers. The watch is magnificent and gathers all the good elements that the Grönefeld accustomed us over the years: clear design signature, exceptional finishes. Read below the official press release. My review with my own photos will follow soon.

When the Horological Brothers, Bart and Tim Grönefeld, decided to embark on a career in watchmaking, they initially chose to study in their native country, before completing their training in Switzerland. Thereafter, they returned to the Netherlands to uphold the family tradition of watchmaking.

Grönefeld 1941 Decennium Tourbillon
Grönefeld 1941 Decennium Tourbillon

In 1998, the Horological Brothers established their own independent atelier in Oldenzaal. Some years later they began creating fine timepieces for the cognoscenti. The first watch to bear their family name, Grönefeld, was launched in 2008. It was the GTM-06, a technical tour de force, combining a tourbillon with a minute repeater. Since then, Bart and Tim have conceived further innovative timepieces, each the recipient of a prestigious award.

Grönefeld 1941 Decennium Tourbillon
Grönefeld 1941 Decennium Tourbillon

To celebrate the company’s 10th anniversary, Grönefeld has unveiled a new watch, the ‘1941 Decennium Tourbillon’. This timepiece is endowed with an array of features, designed to indulge the desires of watch connoisseurs.

Grönefeld 1941 Decennium Tourbillon
Grönefeld 1941 Decennium Tourbillon


A Sculpted Platinum Case

The 1941 Decennium Tourbillon is housed in the company’s 1941 case. Named after the year their father was born, this case exudes grace from every angle. The Decennium Tourbillon receive an exclusive platinum 1941 case.  The sculpted case is executed using a specially shaped cutter to create the characteristic hollowed, concave recesses and convex surfaces. In between each additional cutting phase, the case is polished prior to the next stage of milling, ensuring the precisely defined contours of the case are retained. This process proves incredibly time-consuming, but the outcome justifies the effort.

Grönefeld 1941 Decennium Tourbillon
Grönefeld 1941 Decennium Tourbillon

Measuring 39.5mm in diameter, with a restrained height of 10.5mm, the platinum 1941 case is the epitome of elegance, courtesy of its discreet mien.  With a weight of 118 grams the Decennium Tourbillon is not too heavy to be a daily companion.

Grönefeld 1941 Decennium Tourbillon
Grönefeld 1941 Decennium Tourbillon


A Movement for Purists

An automatic movement ensures the mainspring is optimally wound, resulting in less variation in the rate of the movement. In normal use, the wearer does not need to operate the crown, mitigating the risk of harm to the crown stem. Lastly, an automatic movement confers convenience, making it ideal for daily use.

Grönefeld 1941 Decennium Tourbillon
Grönefeld 1941 Decennium Tourbillon

The automatic movement is fitted with a 22-carat solid red gold monobloc rotor. The rotor is completely hand finished and turns on a ceramic ball bearing, preventing wear and eliminating the need for lubrication.

Despite embracing a new means of powering its latest watch, purists can be rest assured that Grönefeld’s exalted standards of finish prevail. The stainless-steel bridges replicate the facades of the Dutch houses, termed ‘bell gables’. They are hand-bevelled, evincing a brilliant gleam. The centres deliver a sublime contrast with their micro-blasted surfaces and are adorned with relief engraving.

Grönefeld 1941 Decennium Tourbillon
Grönefeld 1941 Decennium Tourbillon

The cage of the flying tourbillon, a tourbillon without an upper bridge, is made of stainless steel. The Horological Brothers use stainless steel for the cage and the aforementioned bridges because it is not liable to corrosion and, as such, proffers lasting benefits to the owner. Working with stainless steel requires great patience, but Bart and Tim believe the end result substantiates the time expended.

The 5-arm, double spoke gear train wheels exhibit a contemporary character with their circular grained surfaces paying due reverence to fine watchmaking tradition. The movement includes a balance wheel with white gold timing screws and is equipped with a free-sprung over-coil hairspring with a triangular stud.

Grönefeld 1941 Decennium Tourbillon
Grönefeld 1941 Decennium Tourbillon

Gold chatons stand testament to the no-compromise specification of this movement. In addition, the mirror polished screws feature chamfered rims and slots. Numerous surfaces gleam, courtesy of the mirror-polishing which has been patiently executed by time-served hands. The inventory of different decorations includes snailed, grained, spotted and frosted surfaces, indulging the desires of purists.

Grönefeld 1941 Decennium Tourbillon
Grönefeld 1941 Decennium Tourbillon

With so much beauty harnessed within this watch, a sapphire case back has been fitted to confer a spectacular view.

The time-consuming creation of each movement means that production will be limited to only 10 examples of the Grönefeld 1941 Decennium Tourbillon.

Grönefeld 1941 Decennium Tourbillon
Grönefeld 1941 Decennium Tourbillon

This watch provides a fitting tribute to the skills of the Horological Brothers and their capacity to create timepieces for discerning collectors.


Grönefeld 1941 Decennium Tourbillon Price and Technical Specifications

The price of the Decennium Tourbillon in platinum is € 145,000.00 excluding taxes.

Technical specifications movement

Movement dimensions

Diameter: 32,0 mm
Thickness: 5,5 mm

Number of parts 259 parts

Power reserve 56 hours

Number of jewels 30 jewels, partially set in solid gold chatons

Automatic system Uni-directional winding mechanism
Oscillating mass 22-karat solid gold entirely decorated by hand. Pivoted on a high precision ceramic ball bearing to avoid excessive wear and the need of lubrication

Tourbillon cage One-minute flying tourbillon cage pivoted on ceramic ball bearing.

Single arm upper cage bridge. Lower Cage and upper cage are both fabricated in stainless steel

Balance wheel Variable-inertia balance wheel with timing screws (diameter 10 mm)

Frequency 21.600 vibrations/hour

Balance spring Free sprung with Phillips terminal over coil curve with Geneva style stud

Escapement Jewelled lateral Swiss lever escapement

Main Plate Spotted and ruthenium electroplated brass main-plate

Bridges Stainless steel, bevels polished by hand, micro-blasted centre, circular grain on the top to highlight the bridges shapes and relief engravings

Displays Central hours and minutes

Case and dial specifications

Number of components 49 parts

Case material Platinum Pt950 (limited edition of 10 pieces)

Case dimensions
Diameter: 39,5 mm
Thickness: 10,5 mm

Water resistance 3 atmospheres – 30 meters – 100 feet

Crown White Gold Au750/Pd210

Dial Base material: Solid Sterling Silver 925

Hands Extended Lancette hour and minute hands. Flame-blued steel and mirror polished centres.

Strap Matte black alligator with alligator lining

Buckle Pin buckle sculpted in platinum Pt950 A vast variety of leathers and colours are available

Crystals Front and back sapphire crystals have anti-reflective coatings on both sides

Total Weight 118 Grams

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