The finesse of curves
The A&S8320 calibre unveils its curves, apertures and details within a 41.5 mm case in platinum (PT 950), released in a run of 28 timepieces. Encased in this precious housing, Arnold & Son’s flying tourbillon stands out for its finesse and precision.
Finesse, because at just 3.3 mm thick, it is one of the slimmest skeleton tourbillon calibres in existence. Precision, because this one-minute flying tourbillon is assembled with a variable-inertia balance for enhanced calibration stability.
Technical Specifications
Functions
Movement
- Jewels:
- 29
- Diameter:
- 32.00 mm
- Thickness:
- 3.30 mm
- Power reserve:
- 100 hours
- Frequency:
- 3 Hz / 21,600 vph
Dial
Case
- Material:
- platinum (Pt950)
- Diameter:
- 41.5 mm
- Thickness:
- 8.40 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:
- brown alligator leather, black alligator leather lining, hand-stitched
- Buckle:
- folding clasp in titanium with cover in platinum (Pt 950)
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Gallery
Radiating originality
The purpose of a skeleton is to convey a message, be it geometric, generic or minimal. For Ultrathin Tourbillon Skeleton, the skeletonisation of the calibre reveals pronounced curves and numerous inflection points that are highlighted by an original finish. On the Ultrathin Tourbillon Skeleton Platinum, the bridges are treated with rose-gold PVD (4N) after being decorated with radiating Côtes de Genève stripes.
The flange around the calibre adopts this same finish, clearly revealing the Arnold & Son signature at 6 o’clock and enabling the off-centred white opal dial to be displayed in its purest form.
Performance reserve
The changes to the tourbillon carriage and regulating organ give the A&S8320 calibre a power reserve of 100 hours. While this is a larger power reserve than for standard tourbillons, particularly slim ones, it is entirely in line with the performance regularly achieved by Arnold & Son calibres.
Golden carriage
At the heart of Ultrathin Tourbillon Skeleton beats the A&S8320 calibre, whose architecture and slimness are its principal protagonists. Designed without an upper bridge to minimise its thickness, the calibre is classed as a flying tourbillon.
The variable-inertia balance with inertia blocks ensures more precise calibration over time. The slender triangular carriage is supported by a double arrow, which is actually a counterpoise. The arrowhead on the staff of the escape wheel serves as a seconds pointer, as the carriage completes one rotation per minute.