The watch we are looking at today combines the precision of a certified chronometer with that of a tourbillon-calibre: the new Arnold & Son Tourbillon Chronometer No. 36. The limited watch is part of the Royal Collection.
Drawing inspiration from the John Arnold pocket chronometer No. 1/36, which will mark its 240th anniversary in 2018, the Tourbillon Chronometer No. 36 is a commemorative creation leading up to the milestone year for the historically significant John Arnold chronometer.
The tourbillon is highlighted in a most significant manner. held by a skeletonized and mirror-polished top bridge, the one-minute tourbillon features a three-spoke design. Prominently positioned on the dial side, the tourbillon can also be viewed from the back, thanks to an opening in the main plate. The tourbillion cage is polished with hand-chamfered polished edges and circular satin-finished surfaces. The same kind of opening as for the tourbillon is made below the small seconds display, adding to the symmetry of the watch.
The dial is protected by a cambered sapphire with anti-reflective coating on both sides; the back is also made from sapphire.
The case measures 46 mm in diameter and is water resistant up to 30 meters.
The Tourbillon Chronometer No. 36 is powered by the A&S8600, a hand-wound mechanical manufacture Arnold & Son calibre. The movement is entirely in-house conceived and manufactured and follows the classical codes of traditional English chronometer movements. The main pivoting elements such as the wheels, barrels, the tourbillon, and others are each mounted on their own bridge. The triangular, multilevel bridges (no less than thirteen) are mostly skeletonized, providing a more contemporary sense of three-dimensional depth to the entire timepiece.
The movement works at a frequency of 4 Hz and provides a power reserve of 90 hours when fully wound. The A&S8600 is COSC certified.
The movement is made from nickel-silver and steel. The main plate and bridges are treated with a golden coating, echoing the aesthetics of the historical pocket watches made by John Arnold. It comes with Haute Horlogerie finishing: sand blasted bridges with chamfered and polished edges.
The Arnold & Son Tourbillon Chronometer No. 36 is a Limited Edition and only 28 pieces will be made. Each one comes at an expense of 38,900€.