1941 Decennium
automatic tourbillon
To celebrate the company's 10th anniversary, Grönefeld has unveiled the '1941 Decennium Tourbillon'. This timepiece is endowed with an array of features, designed to indulge the desires of watch connoisseurs.
An automatic tourbillon 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. A self-winding movement confers convenience, making it ideal for daily use.
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.
The time-consuming creation of each movement means that production will be limited to only 10 examples of the Grönefeld 1941 Decennium Tourbillon.
Alternative available models
1941 Grönograaf
1941 Principia
1941 Principiabalancing mechanics and aesthetics
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.
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 triangular stud.
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.
Details make perfection and perfection is not a detail. Leonardo da Vinci
Technical specifications
Movement
| Calibre | G-07 |
| 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. For 24 hours of autonomy 633 rotations of the Oscillating mass are required |
| Oscillating mass | Entirely decorated by hand. 22 karat solid gold. 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 four white gold timing screws (diameter 10 mm) |
| Frequency | 21.600 vibrations/hour |
| Balance spring | Free sprung with Phillips terminal over coil curve with triangle hairspring 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 center, circular grain on the top to highlight the bridges shapes and relief engravings |
| Indicators | Central hour and minute hands |
Case and dial
| Case model | 1941 |
| Limited edition | 10 pieces only |
| Case material | Platinum Pt950 |
| Case dimensions | Diameter: 39,5 mm Thickness: 10,5 mm |
| Water resistance | 3 atmospheres – 30 meters – 100 feet |
| Engraving | Grönefeld, Platinum, Pt950 and serial number |
| Crown | Platinum Pt950, engraved with The Horological Brothers logo |
| Dial | Sterling Silver 925, Matte grey lacquered with highly polished hour-markers and circular sector |
| Hands | Extended Lancette hands. Flame-blued steel and mirror polished centres. |
| Strap | Matte black genuine alligator, black stitching and alligator lining. 20mm-18mm |
| Buckle | Platinum Pt950 engraved with Grönefeld. 18mm. |
| Crystals | Domed sapphire crystal on the front with hard anti-reflective coating on both sides Flat sapphire crystal on the back with hard anti-reflective coating on both sides |
| Number of components | 49 parts |
| Total weight | 118 Grams |
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