Arnold & Son Nebula 38 Steel

The Nebula 38 is a harmonious yet striking skeleton watch, which fully expresses Arnold & Son’s identity as a Swiss watchmaker with English roots. Its open worked movement ties it to the great tradition of British watchmaking, while its design methods and finishes reflect the very best of Swiss quality.

Following the launch of a red-gold version, the 38 Nebula watch is now available in steel.

The Nebula 38 features a classic three-hand layout indicating the hours, minutes and off-centred small seconds. But in terms of complexity, this timepiece constitutes one of the most graphically striking, high-impact and original skeleton watches.

Arnold & Son Nebula 38 Steel

The open-worked A&S5101 calibre is the major aesthetic attraction of this timepiece. The dial is reduced to a black lacquered flange, while the calibre the steals show with its arrangement, layers and curves, its juxtaposed materials and play on solids and hollows.

The structure of the A&S5101 calibre is based on carefully considered symmetry. Seven bridges span the four axes that cross the Nebula 38, creating a sense of visual balance. Measuring a diameter of 38 mm and a thickness of 8.91 mm, the steel case features a domed sapphire crystal on the dial side and a flat sapphire crystal on the case back.

Arnold & Son Nebula 38 Steel

On the dial side, you can admire the clear view of well structured movement components like a double barrel bridge, crown bridge, balance bridge, gear-train bridges. While all these bridges dialogue with each other on opposing axes within the movement, the functional elements also adhere to this mirrored design.

The small-seconds function at 7 o’clock, for example, is twinned with the balance. While technically different, these two blocks adopt similar shapes to perfect the movement’s sense of equilibrium. The harmony is plain to see, as all the bridges, plates and solid components are open-worked.

Arranging the structures of a skeleton movement in a ring facing inwards is a unique approach. Furthermore, to maintain the sense of symmetry, Arnold & Son moved the winding mechanism linked to the crown stem to the case back, giving it an unusual position that is entirely justified for the overall aesthetic coherence it procures. In spite of this, the Nebula 38 was designed with practicality in mind, as it presents a 90-hour power reserve that is rare for skeleton models.

Arnold & Son style has used a variety of colours, finishes and levels to maintain excellent legibility of this timepiece. The bridges are thus all the same height on the dial side. On the case-back side, a large sapphire crystal reveals a mainplate that has been open-worked to the extreme. Its design features several criss-crossing arcs, with intersecting circles and ellipses that are reminiscent of a Gothic cathedral’s vault.

Technical details

Model: Nebula 38 Steel
Reference 1NECS.B01A

Hours, minutes, small seconds

Calibre A&S5101, hand-wound mechanical
Jewels: 24
Diameter: 31.50 mm
Thickness: 4.04 mm
Power reserve: 90 hours
Frequency: 3 Hz / 21,600 vph

Main plate: chamfered, polished and treated with black ADLC
Bridges: chamfered, polished and NAC-treated
Wheels: chamfered and polished
Chatons: 18-carat gold
Screws: bevelled, with mirror-polished heads

Anthracite flange

Material: Stainless steel
Diameter: 38.00 mm
Thickness: 8.91 mm
Crystal: Domed sapphire with an anti-reflective coating on both sides
Case back: sapphire crystal
Water-resistance: 30 metres / 100 feet

Material: Calfskin, various colours available
Clasp: Pin buckle in stainless steel

Retail price
CHF 13,500 excl. tax (may be subject to modifications)