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Moonlight illuminates a botanical green dial. The “Fern Green” version of Perpetual Moon 41.5 borrows the cool tones of the moon. The paleness of the platinum, the freshness of the fern green, and the midnight blue of the sky create an original flow of colours.
Maturity, diversity and mechanical exclusivity: the Perpetual Moon collection is constantly being enriched with new creations, consistently reaffirming the watchmaking and artistic talents of Arnold & Son. Following two other editions, one with salmon pink accents and another in sky blue, Perpetual Moon 41.5 Platinum is now available in this limited fern green version of 28 timepieces.
Its hue is inspired by the unique colour of the fern, an undergrowth plant found in abundance in the English gardens of Cornwall, the county where John Arnold was born.
Shimmering
The “Stellar Rays” finish enlivens the dial with a sophisticated shimmer. This aesthetic is achieved through cleverly irregular engraving. Various depths and widths of rays coexist and follow on from one another, creating a unique rhythm. Their succession produces a fluctuating play of light, accentuated by the depth created by several layers of transparent lacquer.
Realistically depicted and set against a grained sky with a midnight blue PVD treatment, the large white mother-of-pearl moon is also overlaid with Super-LumiNova. Invisible by day, this added colour gives it a whole new face by night.
Compass
Following in the tradition of the Perpetual Moon collection, the moon is surrounded by Ursa Major and Cassiopeia, both hand-painted and overlaid with luminescent material. The choice of these star patterns is an allusion to the history of marine chronometer-maker John Arnold.
These two constellations have always served as landmarks in the night sky. Halfway between the two easily identifiable groups is Polaris. Its position always shows the north and its elevation angle can be used to estimate the distance from the equator, i.e. the latitude. Before the invention of instruments to determine the longitude, it was the most reliable measure of a ship’s position at sea.
Accuracy
On the case back, a secondary display of the phases of the moon allows fast and accurate adjustment of the moon age. The manually-wound A&S1512 calibre that powers it is able to track its phases with exceptional accuracy. The total duration of a lunar cycle is 29 days, 12 hours, 44 minutes and 2.8 seconds. Arnold & Son has approached this so closely that it would take 122 years for this movement, if constantly wound up, to accumulate a 24-hour discrepancy between the display and astronomical reality.
Like all Arnold & Son’s movements, the A&S1512 calibre was entirely developed, produced, decorated, assembled, adjusted and cased up at the manufacture in La Chaux-de-Fonds. This calibre uses two barrels and has an oscillation frequency of 3 Hz, giving a 90-hour power reserve.
Perpetual Moon 41.5 Platinum, Fern Green edition
Technical specifications
| Functions | hours, minutes, astronomical moon phases, second moon-phase indicator on the back | |
| Movement | ||
| Calibre | A&S1512, mechanical with manual winding | |
| Jewels | 27 | |
| Diameter | 34 mm | |
| Thickness | 5.35 mm | |
| Power reserve | 90 hours | |
| Frequency | 3 Hz/21,600 vph | |
| Decoration | mainplate: rhodium-plated, radiating Côtes de Genève stripes | |
| bridges: polished and chamfered | ||
| wheels: circular satin-finished | ||
| screws: blued and chamfered, polished heads | ||
| second moon-phase indicator: rhodium-plated and circular-grained | ||
| Dial | “Stellar Rays” decoration, fern green PVD treatment | |
| Moon phases | sky: grained, with midnight-blue PVD treatment | |
| constellations: hand-painted, enhanced with Super-LumiNova | ||
| moons: mother-of-pearl discs enhanced with Super-LumiNova, hand-painted details | ||
| Case | ||
| Material | platinum (Pt 950) | |
| Diameter | 41.5 mm | |
| Depth | 11.30 mm | |
| Crystal | domed sapphire with an anti-reflective coating on both sides | |
| Case back | sapphire crystal, anti-reflective coating | |
| Water-resistance | 3 bar (30 m/100 ft) | |
| Strap | ||
| Material | Cornwall green alligator leather, crimson-purple alligator leather lining | |
| Buckle | pin buckle, platinum (Pt 950) | |
| References | 1GLBX.F01A.C285X | |
| Limited edition | 28 timepieces |
