Arnold & Son Luna Magna Platinum Limited Edition

This brand new Luna Magna watch in Platinum boasts an aventurine crystal sky dial featuring a large three-dimensional moon composed of blue aventurine and grey marble.

Featuring a fully polished 950 platinum case, this celestial inspired timepiece also features a white mother-of-pearl hour and minute sub-dial in a satin-brushed ring.

The Arnold & Son Luna Magna Platinum watch is a limited series of only twenty-eight pieces. Set in aventurine crystal, the metallic crystals bring the dial to life with their brilliance. Half of the 12 mm three-dimensional moon is made of grey marble and the other half of aventurine crystal, reflecting the moon’s dual nature.

The hours and minutes are displayed on the graduated dial with twelve Roman numerals bearing the Arnold & Son signature. This eccentric disc owes its luminosity to the slightly iridescent white mother-of-pearl.

Luna Magna Platinum is based on the A&S1021 calibre, which has been fully developed and then assembled and adjusted in Switzerland. Designed around the lunar globe, the movement is hand-wound and features a 90-hour power reserve and regulating mechanism set at 3 Hz. On the back is a secondary display, with clearly legible lunations for fine adjustments.

The celestial mechanism also owes its sophisticated design to the fidelity in its astronomical accuracy. The duration of a complete lunar cycle is 29 days, 12 hours, 44 minutes and 2.8 seconds.

Arnold & Son have succeeded in approximating this cycle such that, if the watch was never stopped, it would take 122 years for the moon-phase display to accumulate a day’s discrepancy from the correct phase. And the correction is easy, since Luna Magna Platinum’s lunar function is accessible directly from the crown.

Technical details

Model: Luna Magna Platinum
Reference: 1LMAX.A01A.C183A

Hours, minutes, astronomical moon-phase (correction one day in every 122 years), moon-phase indicator on back

Calibre A&S1021, hand-wound mechanism
Jewels: 35
Diameter: 37.60 mm
Height: 12.00 mm with three-dimensional moon (4.75 mm without moon)
Power reserve: 90 hours
Frequency: 3 Hz / 21,600 vph

Platinum: pearlised
Bridges: sunray and chamfered Côtes de Genève
Wheels: circular-grained satin finish
Screws: blued and chamfered, polished heads
Moon-phase indicator: circular-grained satin finish

Aventurine crystal
Hour dial: white mother-of-pearl
Flange: blue PVD coating
Moon: diameter: 12.00 mm; grey marble and aventurine crystal

Material: 950 platinum
Diameter: 44.00 mm
Thickness: 15.90 mm (with crystal)
Crystal: Domed sapphire, anti-reflective coating on both sides
Back: Sapphire crystal, anti-reflective coating on both sides
Water resistance: 30 metres/100ft

Material: Alligator leather, blue (exterior) and dark magenta (interior), hand-stitched
Buckle: Pin, platinum PT950

Limited edition of 28 pieces

Global retail price
CHF 55,900 (subject to modification) excl. tax