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Face up photo of Ultrathin Tourbillon Platinum
Chronometry

Ultrathin Tourbillon Platinum

The offset display and the tourbillon aperture echo the way in which information was arranged on John Arnold’s marine chronometers.

Limited to 28 pieces.

Slim and textured

To give the Ultrathin Tourbillon a unique and refined design, Arnold & Son has focused on materials and techniques that highlight the precious appearance of this finely honed tourbillon.

Arnold & Son has used a manufacturing technique known as ‘Cosmic Grené’ on the dials. This name makes direct reference to stargazing, as stars are essential guides for navigating at sea along with marine chronometers (of which John Arnold was one of the largest and most reputable suppliers).

Technical Specifications

Reference: 1UTBX.F01A.C208A
Functions
hours, minutes
Movement
Jewels:
29
Diameter:
32.00 mm
Thickness:
2.97 mm
Power reserve:
100 hours
Frequency:
3 Hz / 21,600 vph
Dial
‘Cosmic grené’:
gold powder mixed with green aluminium sparkles
flange:
coloured and circular satin-finished
Subdial
base:
white mother-of-pearl, domed
ring:
rhodium-plated
Case
Material:
platinum (Pt950)
Diameter:
41.5 mm
Thickness:
8.30 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:
green alligator leather with platinum (PT950) thread, hand-stitched
Buckle:
folding clasp, with top cover in platinum (Pt 950)

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Photo of Ultrathin Tourbillon Platinum

Beneath the stars

Gold powder mixed with aluminium sparkles has been placed on the dial plate to create a lightly sandblasted surface. Due to the complex manufacturing methods involved, this dial is very subtle and finely textured, with a discreet lustre.

Photo of Ultrathin Tourbillon Platinum

Latest-generation carriage

At the heart of the Ultrathin Tourbillon lies the A&S8300 calibre, whose architecture and finesse characterise this collection. At just 2.97 mm thick, this tourbillon with extremely refined finishes is one of the slimmest ever designed.

The highest point of the A&S8300 calibre is located on the top of the tourbillon carriage, which has also been redesigned and undergone significant changes in relation to its predecessors. It features a variable-inertia balance with inertia blocks to ensure more stable calibration over time. The redesigned tourbillon carriage echoes the leading role John Arnold played in marine exploration during the 18th century. Its triangular shape evokes a sextant, while its double-arrow counterpoise represents an anchor. The point in the middle serves as a seconds marker, as the carriage completes a full rotation in one minute.