Arnold & Son Constant Force Tourbillon 11 Platinum | LE11 | SOLD OUT

The 2026 GPHG nominated Arnold & Son Constant Force Tourbillon 11 Platinum is the final expression of the Constant Force 11 collection, created to honor the historic connection between John Arnold and Abraham-Louis Breguet. Limited to just 11 pieces, this exceptional platinum tourbillon watch pairs a classically rounded 41.5 mm case with a solid gold dial featuring hand-executed tremblé guilloché. Crafted with a burin engraver, the irregular pattern evokes the fern-covered moors of Cornwall, the birthplace of John Arnold, while giving the dial an organic texture that makes each piece distinctly individual. A white opal subdial provides the hours and minutes, while the open dial reveals the constant force mechanism and one-minute tourbillon beneath an 18-karat gold bridge. The midnight blue alligator strap and platinum folding clasp complete this refined expression of haute horlogerie.

A limited edition of 11 pieces.
Ref. 1FCBX.Z01A.C0232X

At the heart of the watch, the hand-wound Manufacture Calibre A&S5219 incorporates Arnold & Son’s patented constant force mechanism to maintain stable energy delivery throughout its impressive 100-hour power reserve. Positioned between the gear train and tourbillon, the system continuously regulates torque to support consistent timekeeping while also creating a true-beat seconds display through the blued anchor. The sapphire caseback reveals a movement whose architecture and finishing pay tribute to Breguet’s historic tourbillon regulator, including a delicate mirror-polished tourbillon cage and variable-inertia balance inspired by John Arnold’s chronometers. With its platinum construction, hand-guilloché dial, constant force complication, and historically inspired tourbillon movement, the Constant Force Tourbillon 11 Platinum is a rare collector’s watch that connects 18th-century chronometry with contemporary Swiss haute horlogerie.


TECHNICAL SPECIFICATIONS
Functions
- Hours & minutes
- True-beat seconds
Movement
A&S5219
Calibre Measurements
- 33 mm diameter
- 10.48 mm thickness
Power Reserve
100 hours
Frequency
3 Hz / 21'600 vph
Case
Platinum (Pt 950)
Measurements
- 41.5 mm diameter
- 13.7 mm thickness
Crystal
Domed sapphire with an anti-reflective coating on both sides
Caseback
Domed sapphire with an anti-reflective coating on both sides
Dial
- 18k yellow gold
- Hand-engraved
- Arnold & Son "fern" pattern
Water Resistance
3 atm / 30 meters
Subdial
- White opal
- Concave
Strap
- Midnight blue alligator leather with black alligator leather lining
- Folding platinum (Pt 950) buckle


Oster Jewelers is Your Authorized Arnold & Son Retail Partner