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| Courtesy of Grönefeld |
This is the latest from the Grönefeld brothers Tim and Bart. This is the 2941Quadrivium in tantalum.
Quadrivium (Quad) has four complications in this one watch. Per Grönefeld:
The 1941 Quadrivium unites four of the brand’s most admired complications within a single, extraordinary watch. Developed entirely from the ground up, it features a 7.5-seconds remontoire, a one-minute flying tourbillon, central jumping seconds, and a power reserve indicator, all driven by a movement equipped with serially connected concentric twin barrels.
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| Courtesy of Grönefeld |
This new model is available in two different versions - tantalum (above) and platinum.
Calibre G-09
Mechanical hand-wound movement; tourbillon, remontoire, dead seconds and power reserve indicator
Movement
Diameter 32.0 mm
Thickness: 6.15 mm
Number of components
473 parts in the whole movement
Number of jewels
49 jewels, partially set in gold chatons
Power reserve
50 hours
A satellite-wheel mechanism provides a precise indication of the remaining power reserve
Barrels
Two coaxially arranged barrels connected in series toprovide a continuous and balanced energy supply
Tourbillon
One minute flying tourbillon cage made in stainless steel Durnico
Balance wheel
Titatium free sprung variable inertia balance wheel (10.0 mm diameter)
Frequency
21.600 vibrations/hour
Balance spring
Phillips terminal overcoil curve; Geneva-style stud
Escapement
Swiss lever escapement
Main Plate
Spotted and snailed ruthenium plated brass
Bridges
Hand bevelled; stainless steel. Micro-blasted centre; circular grain on the top; relief engraved in the micro blasted surface
Dead seconds
A dedicated dead-seconds mechanism, positioned above the conventional going train, allows the escapement to operate at its natural frequency while regulating the seconds-hand to advance in precise one-second intervals
Winding-setting
Conventional winding and setting mechanism; hacking seconds at the 60 seconds position
Case
1941 Design. Round, three-piece case featuring a domed sapphire crystal on the front, with anti-glare treatment on both sides. The flat sapphire crystal on the case back is also treated with anti-glare coating on both sides. The case is engraved with the serial number and secured by eight security screws
Number of components
Case: 24 parts
Dial/hands: 27 parts
Case dimensions
Diameter: 40.0 mm
Thickness: 11.3 mm
Water resistance
3 atmospheres - 30 meters - 100 feet
Crown
Engraved with “G” logo
Dial
Base dial in brass, applied stainless steel segments and white gold hour markers. Choice of 5 colors
Hands
Hours and minutes, large counter poised seconds,power-reserve. All hands are steel and heat blued
Indications
Small hours and minutes at 2 o’clock
Extra long jumping seconds hand at the center
Power reserve indicator at 10 o'clock
Visible flying tourbillon cage at 6 o’clock
Visible governor of the remontoire mechanism at 9 o'clock
Strap
Hand-sewn leather, 20mm-18mm
Buckle
Tantalum or Platinum pin buckle, engraved with Grönefeld logo. 18mm
Weight
Tantalum approximately 108 grams, including strap and buckle
Platinum approximately 120 grams, including strap and buckle
















