Flying tourbillon with synchronized seconds – precision and ingenuity
Parallax Tourbillon / RGA limited edition of 28 pieces in 5N red gold
The Grönefeld Parallax tourbillon features a "flying" tourbillon with a large central seconds hand, stop seconds, power reserve indicator and winding-setting function indicator.
The in-house movement, beautiful solid silver dial and highly polished case display sophistication and craftsmanship at the very highest level.
The raised flying tourbillon allows full appreciation of the concentric, rhythmic "breathing" of the balance hairspring, while ensuring high precision.
The name "Parallax" is derived from the precision of the readability of the central seconds hand. Parallax is defined as the apparent change in position of an object when the observer changes his own position.
To minimize the possibility of error due to parallax when viewing the seconds hand from an angle, the hand is exceptionally close to the outer chapter ring with the seconds indexes.
In a neat touch, the one-armed balance wheel bridge always runs parallel to the central seconds hand.
Rather than pulling the crown to set the time, which has the risk of damaging the fragile crown stem, it is pressed. An indicator on the dial displays the function selected: "W" for winding or "S" for time setting.
When the time setting function is selected, both the tourbillon cage-bridge and the central seconds hand automatically continue to their respective 12 o’clock positions where they stop (or hack) while the time is set.
Once the time is set and the function set to winding by a simple press of the crown, both the seconds hand and tourbillon cage start running in parallel again.
The dial of the Parallax Tourbillon has been crafted out of solid silver. The frosted surface provides a gentle sheen superbly setting off the flamed-blued hands and making for excellent legibility.
The graceful curves of the displays are complemented by a multilayered profile endowing the dial with a wonderful sense of depth.
The complex dial comprises seven individual components. All applied elements are rhodium plated with circular graining and beveled edges.
The bevels are polished with diamond paste to a brilliant gloss to create scintillating reflections of light, echoing the high-end finishing of the stainless steel movement bridges visible through the display back.
Bart and Tim Grönefeld use stainless steel bridges exclusively for their movements.
As well as the superior hardness and durability of stainless steel compared to the more generally used steel and brass, the metal gleams when polished to a mirror finish.
Achieving superlative finishes in stainless steel is no easy task: polishing the hard metal takes a master watchmaker up to four times longer than polishing more commonly used brass.
As with the immaculately finished movement bridges, the tourbillon cage is crafted in stainless steel. Three days are required just for the hand finishing of the tourbillon components.
A highly-polished stainless steel sleeve around the tourbillon draws further attention to the beautiful escapement by reflecting the oscillating balance wheel and the rotations of the escape wheel and tourbillon cage.
Normally a central seconds hand requires a friction spring to prevent small fluttering caused by play in the gear train.
But for the Parallax Tourbillon, the Grönefeld brothers developed the movement with an added pinion and wheel so that the energy-sapping friction spring is not required.
The latter feature improves power transfer to the regulator, contributing to the impressive power-72-hour power reserve.
Flying tourbillon, synchronized hacking seconds, hand-wound mechanical movement, push-to-wind/push-to-set crown, power reserve indicator, function indicator setting
No. of parts
No. of jewels
27 jewels set in gold chatons
Gearing Direct gear train to avoid a friction spring for the center seconds hand by means of an additional wheel and pinion
One-minute flying tourbillon cage pivoted on ceramic ball bearings
Upper Cage Bridge with single arm. Fabricated in stainless steel
Lower Cage fabricated in stainless steel
Variable-inertia balance wheel with timing screws (diameter 10 mm)
Free sprung with Phillips terminal overcoil curve, Geneva-style stud
Lateral Swiss lever escapement
Spotted and snailed rhodium plated nickel silver
Stainless steel X46 Cr13, bevels polished by hand, micro-blasted centre and spotted underneath
Circular grain on the top
Relief engraved in the micro blasted surface
Crown with push function to chose between winding or setting
In setting position the cage and seconds-hand will stop at 60 seconds
Classic Breguet mechanism by means of a cone moving up and down on a treaded barrel arbor
Small hours and minutes at 1 o’clock
Visible tourbillon cage at 7 o’clock
Large center seconds on a raised seconds dial to minimalize parallax error
Power Reserve indicator
Winding - Setting indicator
Case and dial
Red Gold Au750 5N
Solid Sterling Silver 925, frosted surface with diamond cut bevels
Hour- Minutes dial, raised Seconds Dial
Power reserve indicator
Domed sapphire crystal on the front with hard antireflective coating on both sides
Flat sapphire crystal on the back with hard antireflective coating on both sides
Polished bezel and centre band with hand-finished straight graining
No. of components
43 mm x 12.5 mm
3 atmosphere – 30 meters – 100 feet
Gold with engraved with “G” logo and push to set/wind function
Extended Lancette hands, flame-blued steel and hand polished centers, large counter poised seconds hand
Hand-sewn mat brown, alligator leather with Red Gold Au750 5N buckle, engraved with Grönefeld logo