Arnold & Son Luna Magna Ultimate I Limited Edition

After presenting the Luna Magna, Swiss luxury watch brand Arnold & Son is presenting a series of high-end jewellery interpretations of its three-dimensional moon model.

In addition to the technical feat of placing a mechanical star measuring 12mm inside a watch, the Luna Magna Ultimate I watch highlights paved and invisibly-set precious stones. The case, measuring 44mm in diameter, is made of white gold and set with 7.62 carats of the highest quality diamonds. These include 20 baguette-cut diamonds on the case’s lugs, cut one by one to fit the unique shape of each mount.

Arnold & Son Luna Magna Ultimate I Limited Edition

A fine ring resembling the ring around Saturn constitutes the bezel, orbiting the Luna Magna Ultimate I case. It contains 112 baguette-cut diamonds totalling 5.90 carats. Light can enter freely, just as it would an open prism, thanks to the dual-row invisible setting which allows for radiance beyond compare.

Hundreds of pure ruthenium crystals make up the sparkling blue façade of the dial. This extremely hard and precious metal belongs to the platinum group. Within the circle of blue radiance lies a dial in the conventional sense, featuring twelve Roman numeral markings, the Arnold & Son signature and the hands. This off-centre subdial owes its delicate colour to white opal, and its finesse befits a piece of the finest jewellery such as the Luna Magna Ultimate I.

Arnold & Son Luna Magna Ultimate I Limited Edition

Beneath the timepiece, the three-dimensional moon is the standout feature of the Luna Magna watches. Gem-setting of the utmost intricacy coats the entire white gold sphere. It is divided into 161 brilliant-cut diamonds for daytime and as many blue sapphires for night-time. The line between the two colours is a ripple of blue and white along the outline of the stones.

Arnold & Son Luna Magna Ultimate I Limited Edition

The Luna Magna Ultimate I watch is equipped with the A&S1021 calibre, which is entirely developed, manufactured, assembled and adjusted in-house at Arnold & Son.

This hand-wound calibre, designed around the lunar globe, has a power reserve of 90 hours and a regulating organ at a frequency of 3 Hz. As for the case back, the movement provides a second display for the lunar phase, featuring easy-to-read graduations for utmost precision when correcting the lunar globe.

Arnold & Son Luna Magna Ultimate I Limited Edition

The celestial mechanism of the Luna Magna Ultimate I watch is extremely accurate. The length of a full moon cycle is 29 days, 12 hours, 44 minutes and 2.8 seconds. Arnold & Son has produced a likeness such that it would take 122 years for the movement to accrue a one-day interval between the watch display and the true celestial cycle. Nevertheless, this error is easy to correct given that the lunar function on the Luna Magna Ultimate I is directly accessible from the crown.

Technical details

Model: Luna Magna Ultimate I
Product reference: 1LMMW.Z01A.C177A

Hours, minutes
Astronomical lunar phases (one-day correction every 122 years)
Moon phase indicator on case 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 the moon)
Power reserve: 90 hours
Frequency: 3 Hz / 21,600 vph

Main plate: circular-grained
Bridges: chamfered, radiating Côtes de Genève
Wheels: circular satin-brushed
Screws: blued and chamfered, polished heads
Moon phase indicator: circular satin-brushed

Main dial: Blue-treated ruthenium crystals
subdial: White opal
Moon: 18 carat white gold, set with 161 diamonds (~0.75 ct) and 161 sapphires (~0.85 ct), diameter: 12.00 mm

Material: 18 carat white gold, bezel with dual-row invisible setting and studded lugs, with a total of 112 baguette-cut diamonds (~5.90 ct)
Diameter: 44.00 mm
Thickness: 15.90 mm (with crystal)
Crystal: Domed sapphire with an anti-reflective coating on both sides
Back: Sapphire crystal with an anti-reflective coating on both sides
Water-resistance: 30 metres / 100 feet

Hand sewn blue or black alligator leather
Buckle: pin, 18 carat white gold, set with 26 baguette-cut diamonds (~0.97 ct)

Diamonds: Total weight ~7.62 ct, Colour D-E-F, Clarity IF-VVS
Sapphires: Total weight: ~0.85 ct, Colour blue, Clarity loupe clean

Limited edition of 8 pieces

Global retail price
CHF 169,000 excl. tax (subject to change) excluding tax