Arnold & Son continues to debut new editions within its impressive Ultrathin Tourbillon Skeleton collection. Two new models display the model’s architectural finesse in new case metals: 5N ‘red’ gold and platinum.
Still built within the same 41.5mm diameter by 8.4mm case size, the new models display this independent maker’s contemporary one-minute tourbillon prominently at the 6 o’clock position, flanked by rose-gold PVD bridges and nicely decorated with radiating Côtes de Genève stripes.
On both models, a white opal dial displays the minutes and hours. The arrowhead on the staff of the tourbillon’s escape wheel serves as the watch’s seconds pointer.
The watchmaker’s 3.3mm-thick A&S8320 caliber movement is one of the thinnest skeleton tourbillons around. Its thinness is enhanced thanks to its lack of an upper bridge, which means the tourbillon is of the ‘flying’ variety. (See additional specifications below). 
As with most Arnold & Son calibers, the power reserve of the Ultrathin Tourbillon Skeleton Red Gold and the UltraThin Tourbillon Skeleton Platinum is a spectacular 100 hours. Each model is a limited edition of twenty-eight pieces.
Prices: Red gold: CHF 74,400, and platinum: CHF 86,200.
Specifications: Arnold & Son Ultrathin Tourbillon Skeleton Red Gold and UltraThin Tourbillon Skeleton Platinum
(Red gold: 1UTBR.Z01A.C246R; Platinum: 1UTBX.Z01A.C245X)
Movement:
Caliber A&S8320, 1-minute flying tourbillon, manual winding, mainplate is skeletonized, rose-gold PVD treatment (4N), Côtes de Genève stripes radiating from the center. Bridges are skeletonized, rose-gold PVD treatment (4N), polished and chamfered by hand, Côtes de Genève stripes radiating from the center. Tourbillon carriage has ‘Arnold & Son’ signature, polished, satin-finished and chamfered by hand. Wheels are circular satin-finished and screws are blued and chamfered with mirror-polished heads. Power reserve is 100 hours. Frequency is 21,600 vph.
Dial: White opal.
Case: 5N red gold or platinum (PT 950) measuring 41.50mm by 8.40mm (with domed sapphire crystal).Case back sapphire crystal with an anti-reflective coating. Water-resistance to 30 meters.
Strap: Red gold: blue alligator leather, black alligator leather lining, hand-stitched. Platinum: brown alligator leather, black alligator leather lining, hand-stitched. Folding clasp in titanium with cover in red gold or platinum.
Prices: Red gold: CHF 74,400, and platinum: CHF 86,200.
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