• Arnold & Son Nebula 40 Steel Exploring the Skeletonized Movement
  • Arnold & Son Nebula 40 Steel

    Exploring the Skeletonized Movement

    Hourstriker Staff
    Words by: Hourstriker Staff
    December 19, 2024
  • Arnold & Son has been a name synonymous with innovation and precision in the world of watchmaking for centuries. Tracing its roots back to the 18th century, the brand is named after the legendary English watchmaker John Arnold, whose marine chronometers were instrumental in solving the longitude problem, a challenge that had plagued sailors for generations. His inventions revolutionized navigation, making sea voyages safer and more predictable. The brand's commitment to accuracy and quality has endured, cementing its reputation as a leader in the horological world. Arnold & Son has consistently pushed boundaries, embracing both traditional craftsmanship and cutting-edge technology to create timepieces that are both functional masterpieces and objects of beauty.

    The Nebula 40 Steel is the latest addition to the Arnold & Son family, a watch that showcases the brand's exceptional craftsmanship and design philosophy. The name "Nebula" is inspired by the vast, star-forming regions in space, and this inspiration is vividly reflected in the watch's design. The Nebula 40 Steel is a marvel of engineering and aesthetics, featuring a fully skeletonized movement that appears to float within its case, much like a nebula suspended in the cosmos. The watch's design is a harmonious blend of intricate mechanics and sleek, modern lines, creating a timepiece that is both visually stunning and technically impressive.

    Courtesy of Arnold & Son
    Courtesy of Arnold & Son


    The case of the Nebula 40 Steel is a study in understated sophistication. Crafted from stainless steel, it measures a universally appealing 40mm in diameter, a size that strikes a perfect balance between presence and wearability. The case thickness is a mere 9.10mm, making it surprisingly slim for a watch with such a complex movement. The case features softened flanks and plunging lugs, giving it a streamlined and modern appearance. The bezel is softly rounded, drawing the eye inwards towards the watch's captivating dial. The case back is fitted with a sapphire crystal, providing a clear view of the intricate movement within, allowing the wearer to appreciate the watch's inner workings.

    The domed sapphire crystal on the front of the watch is treated with an anti-reflective coating on both sides, ensuring optimal readability in various lighting conditions. This attention to detail underscores Arnold & Son's commitment to both form and function. The crystal's slight curvature adds a subtle depth to the dial, enhancing the overall aesthetic. The water resistance of the watch is rated at 3 bar, equivalent to 30 meters or 100 feet, making it suitable for everyday wear but not intended for diving or extended water exposure.

    The heart of the Nebula 40 Steel is its magnificent skeletonized movement, the A&S5201 calibre. This hand-wound movement is a true work of art, with every component meticulously designed and finished to the highest standards. The movement is fully visible through both the front and back of the watch, revealing its intricate architecture and the mesmerizing dance of its gears and wheels. The movement's design is inspired by nebulae, with seven bridges arranged in a star-like pattern, radiating from the center. These bridges are not merely decorative; they are functional elements that support the movement's components. Each bridge is skeletonized, with hollowed-out centers and carefully polished chamfers, creating a sense of lightness and transparency.

    Courtesy of Arnold & Son
    Courtesy of Arnold & Son


    The movement's layout is a study in symmetry and balance. The seven bridges, each precisely shaped and positioned, create a harmonious structure that is both visually appealing and technically sound. On the case back, two large intersecting ogival bridges support the movement's functional organs, adding to the overall aesthetic coherence. The A&S5201 calibre is a testament to Arnold & Son's mastery of watchmaking, combining traditional techniques with innovative design to create a movement that is both beautiful and reliable.

    The A&S5201 calibre is equipped with two large barrels arranged in series, providing an impressive 90-hour power reserve. This extended power reserve is exceptional for a skeletonized watch, where space is often at a premium. The energy from the barrels is transmitted to the gear train, which follows the star-shaped arrangement of the bridges. The balance wheel, positioned at the end of this train, oscillates at a frequency of 3 hertz, or 21,600 vibrations per hour. These technical features combine to make the A&S5201 calibre a rare and remarkable achievement in the world of watchmaking.

    The dial of the Nebula 40 Steel is a minimalist masterpiece, designed to complement the intricate movement without overshadowing it. The flange surrounding the movement is treated with a black finish, providing a striking contrast to the rhodium-plated appliques that serve as hour markers. The hands are sleek and understated, ensuring that they do not detract from the visual impact of the skeletonized movement. The small seconds sub-dial, located at the 7 o'clock position, adds a touch of asymmetry to the otherwise symmetrical layout, enhancing the watch's visual interest.

    Courtesy of Arnold & Son
    Courtesy of Arnold & Son


    The Nebula 40 Steel is presented on a black rubber strap, chosen for its durability and comfort. The strap is secured with a stainless steel pin buckle, ensuring a secure and comfortable fit on the wrist. The choice of rubber adds a sporty touch to the watch's design, making it versatile enough for both casual and formal occasions. The strap's black color complements the watch's overall aesthetic, creating a cohesive and visually pleasing package.

    A watch collector viewing the Nebula 40 Steel for the first time would be immediately struck by its unique and captivating design. The skeletonized movement, with its star-like arrangement of bridges, would draw the eye inwards, inviting closer inspection. The intricate details of the movement, from the polished chamfers to the precise alignment of the gears and wheels, would be a testament to the watchmaker's skill and artistry. The collector would appreciate the way the light plays off the various surfaces, creating a dynamic and ever-changing visual experience.

    The slim profile of the case and the comfortable fit of the strap would make the watch a pleasure to wear. The collector would also note the watch's exceptional power reserve, a practical feature that sets it apart from many other skeletonized watches. The combination of technical excellence and aesthetic beauty would make the Nebula 40 Steel a highly desirable addition to any collection.

    Courtesy of Arnold & Son
    Courtesy of Arnold & Son


    The Nebula 40 Steel is a watch that embodies the spirit of innovation and craftsmanship that has defined Arnold & Son for centuries. It is a timepiece that celebrates the beauty of mechanics, showcasing the intricate workings of its movement in a way that is both elegant and captivating. The watch's design is a testament to the brand's commitment to pushing boundaries and exploring new frontiers in watchmaking.

    Arnold & Son has always been a brand that values both tradition and innovation. The Nebula 40 Steel is a perfect example of this duality, combining traditional watchmaking techniques with a modern design aesthetic. The skeletonized movement is a nod to the brand's historical roots, while the sleek and streamlined case design reflects a contemporary sensibility. This blend of old and new is what makes Arnold & Son watches so unique and appealing to collectors.

    The brand's dedication to quality is evident in every aspect of the Nebula 40 Steel. From the precision of the movement to the refinement of the case finishing, every detail has been carefully considered and executed to the highest standards. This commitment to excellence is what has earned Arnold & Son its reputation as one of the leading names in the world of luxury watchmaking.

    Courtesy of Arnold & Son
    Courtesy of Arnold & Son


    The Nebula 40 Steel is a watch that demands attention, not through flashy design or ostentatious embellishments, but through the sheer beauty of its mechanics. The skeletonized movement is the star of the show, a mesmerizing display of watchmaking artistry that is sure to captivate anyone who sees it. The watch's design is a celebration of the intricate workings that lie beneath the surface, a reminder that beauty can be found in the most unexpected places.

    The Nebula 40 Steel is priced at $17,300 excluding VAT. This price point reflects the watch's exceptional quality, craftsmanship, and innovative design. It is a watch that is built to last, a timepiece that will be treasured for generations to come. The Nebula 40 Steel is currently available through authorized Arnold & Son retailers worldwide, offering watch enthusiasts and collectors the opportunity to own this remarkable timepiece.

    Case: Stainless steel. 40mm diameter. 9.10mm thickness. Domed sapphire crystal, anti-reflective coating both sides. Sapphire crystal case back, anti-reflective coating. 3 bar (30 meters/100 feet) water resistance.

    Movement: A&S5201 calibre. Hand-wound. Skeletonized. 24 jewels. 31.10mm diameter. 4.18mm thickness. 90-hour power reserve. 3 Hz / 21,600 vph frequency.

    Dial: Black-treated flange. Rhodium-plated appliques.

    Strap: Black rubber. Stainless steel pin buckle.

    Price: $17,300 excluding VAT.

    Notes: Skeletonized movement with seven bridges in a star-like pattern. Inspired by nebulae. Unusually long 90-hour power reserve for a skeletonized watch.
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