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Face up photo of Ultrathin Tourbillon Skeleton Platinum

Ultrathin Tourbillon Skeleton Platinum

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 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.

CHF 86,500
incl. VAT
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Technical Specifications

Reference: 1UTBX.Z01A.C245X
hours, minutes
32.00 mm
3.30 mm
Power reserve:
100 hours
3 Hz / 21,600 vph
white opal
platinum (Pt950)
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)
brown alligator leather, black alligator leather lining, hand-stitched
folding clasp in titanium with cover in platinum (Pt 950)

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Photo of Ultrathin Tourbillon Skeleton Platinum

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.

Photo of Ultrathin Tourbillon Skeleton Platinum

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.