A watch that paints actual constellations on its dial is not something you see every day. The Arnold & Son Perpetual Moon 41.5 Colours of the Moon Blue does exactly that, turning a small pocket of mother-of-pearl into a working replica of the sky above the Northern Hemisphere.
Limited to just 18 pieces worldwide, this Swiss timepiece is now available in India through Ethos Watch Boutiques, priced at Rs 27,00,000.
Arnold & Son has spent over a decade refining its moon phase watch lineup, and this Blue edition is arguably the most artistically ambitious version yet.
It combines old world hand-finishing with a genuinely new material technique, and the result is a watch that looks as much like a piece of astronomy art as it does a timekeeper.
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What Makes the Perpetual Moon Collection Special
Arnold & Son introduced the Perpetual Moon collection at Baselworld 2013, built around one idea: make the moon phase display the hero of the watch instead of a small side feature.
Most brands tuck their moon indicator into a tiny window near six o’clock. Arnold & Son instead built a 29mm aperture that dominates the dial.
A moon phase complication is a mechanism that tracks the roughly 29.5 day lunar cycle and shows the moon’s current phase, from new moon to full moon, through a rotating disc under the dial. It is one of horology’s oldest complications, dating back centuries before wristwatches existed.
The design language stuck, and today the Perpetual Moon family spans steel, gold and platinum cases, with dial treatments ranging from aventurine glass to hand painted skies like the one on this Blue edition.
Inside the Colours of the Moon Blue Dial
This particular reference introduces something Arnold & Son had never done before: a PVD-treated blue mother-of-pearl dial paired with a matching blue moon-phase disc.
PVD, or physical vapour deposition, is a coating process that bonds a thin layer of colour onto a surface without altering its natural shimmer.
The moon-phase sky is hand-painted with two constellations, the Big Dipper and Cassiopeia, both historically used by sailors in the Northern Hemisphere to locate the North Star.
Each moon on the display is treated with Super-LumiNova, a luminous coating that glows in the dark, so the constellations remain visible even after sunset.
Every dial in this 18-piece run goes through manual painting, which means no two watches are ever pixel-perfect matches of each other, a detail collectors of limited-edition pieces tend to appreciate.
Case, Strap and Movement Details
| Specification | Detail |
|---|---|
| Case size | 41.5mm |
| Case thickness | 11.30mm |
| Case material | Stainless steel |
| Water resistance | 30 metres |
| Strap | Ink blue alligator leather |
| Clasp | Steel pin buckle |
| Movement | A&S1512, manual winding |
| Power reserve | Approximately 90 hours |
| Frequency | 21,600 vibrations per hour (3Hz) |
| Jewels | 27 |
| Limited edition | 18 pieces |
| Warranty | 2 years |
| Country of origin | Switzerland |
The 41.5mm steel case keeps the watch wearable day to day, which is notable given how much visual weight the dial carries. A sapphire crystal caseback lets owners see the movement, along with a secondary moon-phase indicator that mirrors the one on the dial.
The A&S1512 Movement Explained
At the heart of the watch sits the in-house A&S1512 calibre, a manual winding movement that Arnold & Son engineered specifically for extreme moon phase accuracy.
A manual winding watch has no automatic rotor, so it needs to be wound by hand through the crown, typically once a day or every few days depending on the power reserve.
This calibre runs on twin barrels, delivering close to 90 hours of power reserve from a single wind, roughly enough to skip winding over a long weekend.
Its standout number is astronomical accuracy: the moon phase display drifts by just one day every 122 years, a level of precision most moon phase watches cannot match.
Turn the watch over and the finishing on display includes Cotes de Geneve striping, chamfered bridges, circular graining and blued screws, all done by hand.
Price and Availability in India
The Arnold & Son Perpetual Moon Colours of the Moon Blue is priced at Rs 27,00,000 in India and is sold through Ethos Watch Boutiques, the brand’s official retail partner in the country.
Given the 18-piece global limit, interested buyers are advised to request priority access directly through the boutique rather than expect walk-in stock.
Because this is an ultra limited Swiss watch sold exclusively through boutique channels, it does not carry a listing on mainstream Indian marketplaces.
Owners who want to protect this kind of investment piece typically look at dedicated watch care accessories instead, which are widely available online.
| Accessory | Why it helps | Where to check |
|---|---|---|
| Automatic watch winder | Keeps a manual or automatic watch running when not worn daily | Check price on Amazon |
| Luxury watch storage box | Protects the case and strap from dust and scratches | View on Amazon |
| Leather strap conditioner kit | Keeps alligator and leather straps supple over time | See the listing |
| Microfiber watch cleaning cloth | Safe daily cleaning for sapphire crystal and steel cases | Browse on Amazon |
A Watch Built Around a Story
What separates the Perpetual Moon Colours of the Moon Blue from most luxury watches is that it is not just showing time, it is showing a scene.
The Big Dipper and Cassiopeia hand-painted into the dial were tools real navigators once used to find their way home. Arnold & Son has essentially shrunk that piece of celestial navigation history onto an 11.30mm thick canvas.
With only 18 pieces made, this reference is likely to become a talking point among Indian collectors who follow independent and boutique Swiss watchmaking, especially those already drawn to astronomical complications.