Unveiling the Arnold & Son Constant Force Tourbillon 11: A Masterpiece of Precision and Craftsmanship
Arnold & Son has once again pushed the boundaries of horological artistry with the release of the Constant Force Tourbillon 11, a stunning yellow gold edition limited to just 11 pieces. This timepiece is not only a testament to the brand’s commitment to blending tradition with innovation but also a tribute to two titans of watchmaking history—John Arnold and Abraham-Louis Breguet. With its sophisticated constant force mechanism, breathtaking aesthetics, and meticulous craftsmanship, this watch is a collector’s dream and a marvel of engineering.
The Essence of Constant Force: Precision Redefined
At the heart of the Constant Force Tourbillon 11 lies its namesake feature: the constant force mechanism. But what exactly does “constant force” mean in the context of a mechanical watch, and why does it matter?
In a traditional mechanical movement, energy from the mainspring is transmitted to the escapement—the component responsible for regulating timekeeping. However, as the mainspring unwinds, the force it delivers weakens, leading to slight inconsistencies in the rate at which the balance wheel oscillates. These variations can compromise accuracy, especially in high-precision timepieces. The constant force mechanism solves this problem by acting as an intermediary “energy buffer.” It stores and releases a steady, uniform amount of energy to the escapement, regardless of the mainspring’s winding state. This ensures that the balance wheel beats with unwavering consistency throughout the watch’s impressive 100-hour power reserve.
In the Constant Force Tourbillon 11, this mechanism is paired with a one-minute tourbillon—a rotating cage that counters the effects of gravity on the escapement—further enhancing accuracy. Together, these features elevate the watch to a level of chronometric excellence that honors the legacies of Arnold and Breguet, both pioneers in precision timekeeping.
A Movement That Dazzles: Calibre A&S5219
The beating heart of this timepiece is the hand-wound Calibre A&S5219, a mechanical masterpiece designed and crafted in-house by Arnold & Son. Operating at a frequency of 3 Hz (21,600 vibrations per hour), the movement comprises 35 jewels and measures 33 mm in diameter with a thickness of 10.48 mm. Its architecture is as functional as it is beautiful, with finishes that showcase the artistry of haute horlogerie.
The mainplate and barrel bridge boast a 3N golden finish with grained textures and polished angles, while the tourbillon bridge features stretched edges and a satin-finished Durnico steel retaining spring. The constant force bridge, crafted from 18-carat yellow gold, is adorned with polished bevels and satin-finished surfaces, and the screws are blued with chamfered, mirror-polished heads. The tourbillon itself is a visual spectacle, with a mirror-polished carriage plate, rhodium-finished balance, and flame-blued components that add a pop of color to the intricate assembly.
A special engraved plate reading, “To the revered memory of John Arnold and Abraham-Louis Breguet. Friends in their time, legendary watchmakers always,” serves as a poignant reminder of the historical inspiration behind this creation. It’s a fitting homage to two men whose innovations continue to shape modern watchmaking.
Design and Aesthetics: Elegance in Every Detail
The Constant Force Tourbillon 11 is housed in a 41.5 mm case made of 18-carat yellow gold (3N), with a depth of 13.7 mm. The case is topped with a domed sapphire crystal featuring anti-reflective coating on both sides, offering a clear view of the dial and movement. The case back, also sapphire crystal, provides a window into the mesmerizing mechanics within.
The dial is a work of art in its own right, crafted from white Grand Feu enamel atop an 18-carat yellow gold base. This traditional enameling technique ensures a flawless, luminous finish that complements the watch’s luxurious aesthetic. A concave white opal hour dial adds depth and contrast, while the true-beat seconds function—a hallmark of precision—ticks rhythmically, showcasing the constant force mechanism in action.
The watch is completed with a midnight blue alligator leather strap, lined with black alligator leather for added comfort and durability. A pin buckle in matching 18-carat yellow gold secures the strap, maintaining the cohesive elegance of the design.
A Rare Gem: Limited to 11 Pieces
With only 11 examples produced, the Constant Force Tourbillon 11 is as exclusive as it is exquisite. Priced at CHF 129,800 (including VAT, subject to change) in Switzerland, this timepiece reflects the pinnacle of Arnold & Son’s craftsmanship and technical prowess. Each watch is a numbered masterpiece, bearing the reference 1FCBJ.E01A.C246J, and destined to become a prized possession for discerning collectors.
The Arnold & Son Constant Force Tourbillon 11 is more than just a watch—it’s a celebration of horological heritage and a showcase of cutting-edge engineering. By integrating a constant force mechanism with a tourbillon, Arnold & Son has created a timepiece that delivers exceptional accuracy while paying tribute to the genius of John Arnold and Abraham-Louis Breguet. From its hand-finished movement to its luxurious materials, every element of this watch exudes sophistication and precision. For those fortunate enough to own one of the 11 pieces, it’s not just a timekeeper—it’s a piece of history on the wrist.
