Arnold & Son Grand Tourbillon Perpetual

Arnold & Son presents a new grand complication watch endowed with tourbillon and perpetual calendar. It is available in white gold and red gold versions.

Designed to compensate for the detrimental effects of gravity on the movement, the Tourbillon is one of the most challenging horological accomplishments.

In the Arnold & Son Grand Tourbillon Perpetual complication watch, the Tourbillon carriage is beautifully highlighted through a generous opening in the lower part of the dial.

It is complemented by an impressive array of additional functions: Equation of Time, displayed in a window just above the center of the dial, to help keep track of the difference between sidereal time and civil time used on Earth; Perpetual Calendar indications, including days of the week, months, retrograde date and leap-year cycle on the backside; finally a precision Moon-phase display, also on the backside, calculated on the true synodic period of the moon.

All perpetual calendar indications can be independently set by means of two pushpieces at 2 and 10 o’clock and two recessed correctors at 4 and 8 o’clock, or else adjusted simultaneously by the corrector at 9 o’clock.

The Arnold & Son Grand Tourbillon Perpetual watch is limited to 20 pieces: 10 in white gold and 10 in red gold.

Technical details

Models
Ref. 1GTBW.S03A.C20BD: Grand Tourbillon Perpetual with white gold case and silver dial
Ref. 1QPAR.BO2.C20BD: Grand Tourbillon Perpetual with rose gold case and black dial

Case
45mm diameter
18K gold

Movement
Grand Tourbillon perpetual calibre A1768, hand-wound mechanical movement, 68-hour power reserve. Tourbillon at 6 o’clock, perpetual calendar taking account of months of 28, 30 and 31 days, as well as a 29-day month of February every fours hours years, equation of time and on the backside, the moon-phases and leap-years.

Functions
Days and months displayed through apertures located at 9 and 3 o’clock respectively; the date by a retrograde pointer-type display sweeping over the upper part of the dial; the equation of time displayed through an opening above the hour and minute hand axis. On the back side, the leap years, by a pointer-type display positioned at the top of the movement: four-year cycle symbolized by the markings 1, 2, 3 and B (for bissextile or leap year), and a high precision moon-phase display.

Strap
Large scale genuine crocodile strap