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Face up photo of Ultrathin Tourbillon Skeleton Red Gold

Ultrathin Tourbillon Skeleton Red Gold

With its graceful curves and wide apertures, Ultrathin Tourbillon Skeleton also stands out for its slimness.

Limited to 28 pieces.

The finesse of curves

The A&S8320 calibre unveils its curves, apertures and details within a 41.5 mm case red gold (5N), 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.

CHF 74,600
incl. VAT
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Technical Specifications

Reference: 1UTBR.Z01A.C246R
hours, minutes
32.00 mm
3.30 mm
Power reserve:
100 hours
3 Hz / 21,600 vph
white opal
18K red gold 5N
41.5 mm
8.40 mm
domed sapphire, with an anti-reflective coating on both sides
sapphire crystal, with an anti-reflecting coating
Water resistance:
3 bar (30 metres/100 feet)
blue alligator leather, black alligator leather lining, hand-stitched
folding clasp in titanium with cover in 18K red gold (5N)

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Photo of Ultrathin Tourbillon Skeleton Red Gold

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 Red Gold, 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.

Photo of Ultrathin Tourbillon Skeleton Red Gold

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.