A harmonious radiating skeleton
Elegant in its symmetry. Refined in its detail. Relevant in its strong horological focus. Nebula 40 Steel is a one-of-a-kind skeleton timepiece in which Arnold & Son combines style and substance, movement and design. The star-shaped arrangement of its seven bridges and even its name, Nebula, create a coherent system: the radiating concept that governs the form of Nebula 40 Steel and determines its structure, topography and depth.
Technical Specifications
Functions
Movement
- Calibre:
- A&S5201 (view calibre)
- Jewels:
- 24
- Diameter:
- 31.10 mm
- Thickness:
- 4.18 mm
- Power reserve:
- 90 hours
- Frequency:
- 3 Hz / 21,600 vph
Dial
Case
- Material:
- stainless steel
- Diameter:
- 40 mm
- Thickness:
- 9.10 mm
- Crystal:
- domed sapphire, with an anti-reflective coating on both sides
- Back:
- sapphire crystal, with an anti-reflecting coating
- Water resistance:
- 3 bar (30 metres/100 feet)
Strap
- Material:
- blue rubber
- Buckle:
- pin buckle, stainless steel
Interested in this watch?
Gallery
Convergence
Radiating towards the centre, the bridges are arranged around the edge of the main plate, itself formed of intersecting curves. These bridges meet in the middle to give Nebula 40 Steel its structural integrity and provide additional anchor points for the movement’s components.
Just as each bridge follows the last in quick succession, the organs inside the A&S5201 calibre are arranged in a peripheral kinematic chain. The two large barrels that provide Nebula 40 Steel with a 90-hour power reserve, as well as the balance and small seconds, are positioned along four lines of symmetry. This equilibrium is one of the signatures of the collection.
Transcendence
Nebula 40 Steel also comes to life thanks to a host of details stemming from Arnold & Son’s technical requirements, which produce an understated aesthetic effect. These include the openworked bridges with chamfered edges, and the crown mechanism, which has been inverted and transposed to the case-back side to create symmetry with the first wheel at 9 o’clock. The same is true of the wide click spring, which controls the unwinding of the first barrel; the appliqué hour-markers, which have the same faceted design as the hands; and the proportions of the 40 mm-diameter case, which is balanced by a thickness of 9.10 mm to ensure complete elegance on the wrist.
Fascination
Last but not least, Nebula 40 Steel, Blue Edition is a confluence of colours. As its name suggests, the dominant shade is the blue of the movement. All the lower levels of the calibre feature a blue PVD treatment, and this hue influences the finishes: horizontal satin on the dial side of the main plate, and Arnold & Son’s signature ‘Rayons de la Gloire’ motif on the reverse.
In contrast, the bridges, ratchets, cogs and even the balance have a palladium finish to echo the colour of the steel case. A blue strap in alligator leather or rubber completes the timepiece. Arnold & Son is also presenting a version with a three-link steel bracelet, whose understated design allows the balanced arrangement of the case and movement to truly shine.
