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The Grönefeld 1941 Principia Automatic is offered with an array of dials, all crafted in solid sterling silver. The would-be wearer can choose from a cream lacquered dial with roman numerals, a refreshing matt turquoise or light blue dial with polished applied baton hour markers. Alternatively, the company's rhodium plated or gold plated salmon dials are also available.
The Principia is housed in the company's 1941 case. Named after the year their father Sjef was born, the 1941 case exudes grace from every angle. It is available in red gold, white gold or stainless steel. A sapphire case back has been fitted to confer a spectacular view on the extensively hand finished movement with their well known stainless steel bridges and a 22K solid gold oscillating weight.
Each movement is finished and assembled by hand. To emphasize the manual labour involved a gold plate, engraved with an individual number, is applied to the movement.
CaliberG-06Movement dimensionsDiameter: 32,0 mm
Thickness: 5,5 mm
Number of parts 226 parts
Power reserve 56 hours
Number of jewels 31 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
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 Swiss lever
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
DisplaysCentral hours and minutes Small seconds at 6 o’clock
Case dimensions Diameter: 39,5 mm Thickness: 10,5 mm
Water resistance 3 atmospheres – 30 meters – 100 feet
MaterialWhite Gold Au750/Pd210 (Non Rhodium plated), Red Gold Au750 5N or Stainless Steel
Engraving: Grönefeld and the individual number
Crown Case matching material, engraved with The Horological Brothers logo
Dial Base material: Solid Sterling Silver 925
Hands Extended Lancette hands. Flame-blued steel and mirror polished centres. Small poised seconds handStrap
A vast variety of leathers and colors are available. 20mm-18mm
Buckle Pin buckle made in Red Gold Au750 5N, White Gold Au750/Pd210 (non rhodium plated) or Stainless Steel 916L 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 54 parts
Total weight Stainless Steel 74 Grams
Red Gold 97 Grams
White Gold 97 Grams