ARNOLD & SON – CHRONOMETRY Nebula 40 Steel Blue Edition

ARNOLD & SON – CHRONOMETRY Nebula 40 Steel Blue Edition - 2025

Click, to see the large size. ▶ BIG FOTO  

 NEBULA 40 STEEL BLUE EDITION
A HARMONIOUS RADIATING SKELETON

Click, to see the large size. ▶ BIG FOTO 

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. 

Click, to see the large size. ▶ BIG FOTO 

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.

Click, to see the large size. ▶ BIG FOTO  

 Following the launch of Nebula 40 Steel in black and a golden edition celebrating 260 years of John Arnold’s legacy, a blue version is joining the variations on this skeletonised timepiece.

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.

Click, to see the large size. ▶ BIG FOTO 

Just as each bridge follows the last in quick succession, the organs inside the A&S5201 calibre are arranged in a peripheral kinematic chain. 

Click, to see the large size. ▶ BIG FOTO 

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. 

Click, to see the large size. ▶ BIG FOTO   

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. 

Click, to see the large size. ▶ BIG FOTO 

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. 

Click, to see the large size. ▶ BIG FOTO 

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.

Click, to see the large size. ▶ BIG FOTO 

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.  

Click, to see the large size. ▶ BIG FOTO 

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.

---------------------------------------------
TECHNICAL SPECIFICATIONS

Collection:  CHRONOMETRY

Model: CHRONOMETRY Nebula 40 Steel Blue Edition

Click, to see the large size. ▶ BIG FOTO 

Reference: 1NEGS.U01A.S135D

Click, to see the large size. ▶ BIG FOTO 

Reference: 1NEGS.U01A.C1235S

Click, to see the large size. ▶ BIG FOTO 

Reference: 1NEGS.U01A.K0243S

Case
    Material: Stainless steel
    Diameter: 40 mm
    Thickness: 9.10 mm
    Crystal domed sapphire, double-sided anti-reflective coating
    Case back sapphire crystal, anti-reflective coating
    Water-resistance: 3 bar (30 metres/100 feet)
Dial and hands
    Skeletonised dial
    Flange with blue PVD treatment, rhodium-plated appliqués
Movement
    Calibre A&S5201
    Manual winding movement
    Diameter: 31.10 mm
    Thickness: 4.18 mm
    Frequency: 3 Hz, 21'600 vph
    Number of jewels: 24
    Power reserve of 90 hours
Functions/Indications
    Hours, minutes, small seconds
Strap and buckle
    Stainless steel, blue alligator leather or blue rubber
    Clasp stainless steel, folding clasp on steel bracelet, pin buckle on alligator or rubber straps

🔴 Price:
    CHF 17'600 incl. taxes (steel bracelet)
    CHF 16'900 incl. taxes (alligator strap)
    CHF 16'700 incl. taxes (rubber strap)

 ---------------------------
Press releases - 2025
-----------------------------
------------------------------------------
Marketing & Sales
Boulevard des Eplatures 38
CH – 2300 La Chaux-de-Fonds
Switzerland
info@arnoldandson.com
------------------------------------------------
www.facebook.com - Arnold and Son 1764
----------------------------------------------------
www.Arnold&Son.com