Arnold & Son Ultrathin Tourbillon Skeleton Watch

Arnold & Son Ultrathin Tourbillon Skeleton

The **Arnold & Son Ultrathin Tourbillon Skeleton** represents one of the brand’s most refined openworked expressions. Building on the 2016 UTTE Skeleton, this updated edition brings improved visual depth, stronger mechanical architecture, and an extended **100-hour power reserve**.

For readers who want to learn more about ultra-thin movements, see this technical guide on Hodinkee.

The watch features a **41.5mm 18K rose gold case**, now slightly refined from the earlier 42mm version. Despite its broader surface area, the profile remains exceptionally thin at **8.34mm**, contributing to its comfortable wrist presence. A slimmer polished bezel further enhances the openness of the skeletonized movement.

The **fully skeletonized dial** retains the signature **figure-eight symmetry**, with a **white opal time subdial at 12 o’clock** and a redesigned **flying tourbillon at 6 o’clock**. The anchor-shaped tourbillon cage reflects Arnold & Son’s maritime heritage. The removal of the seconds track highlights the elegance of the tourbillon’s structure.

Inside is the **A&S8320 hand-wound movement**, operating at **21,600 vph**. Its power reserve has been increased from 90 to **100 hours**, and the entire caliber is only **3.3mm thick**. A variable-inertia balance wheel improves precision, while the mainplate showcases **radiating Côtes de Genève**.

The model is completed with a **blue alligator leather strap**, produced in a **limited edition of 28 pieces**, and priced around **€70,000**.

Arnold & Son Ultrathin Tourbillon Skeleton

18K rose gold case, 41.5mm diameter, 8.4mm thickness, sapphire crystal, skeleton dial, A&S8320 hand-wound movement, 29 jewels, 21,600 vph, 100-hour power reserve, alligator strap, folding clasp, 30m water resistance.
Complication: Tourbillon