Arnold & Son Ultrathin Tourbillon Onyx Edition

One of the slimmest flying tourbillon watches on the market, the Ultrathin Tourbillon is available in 5N red gold or platinum, each in a limited edition of eight pieces. Its broad dial fully exploits the deep black of the onyx, enhancing the sweep of the regulating organ at 6 o’clock.

When John Arnold began his career in London in 1762, only a handful of leading watchmakers – including George Graham, Thomas Mudge and John Harrison – used pierced rubies to reduce friction at the pivots of the final wheels of the gear train and the balance. Long a closely guarded secret among English master watchmakers, John Arnold also employed this savoir-faire in jewels in the escapements of his marine chronometers and deck watches.