Guided by astronomy, the navigators from the past where faithfully accompanied by the stars and the moon during their quest of discovery. The new HM Perpetual Moon Aventurine is a tribute to these explorers. A new elegant high-precisely Moonphase for the modern adventurer. One of the biggest Moonphase in the market mixed with a beautiful blue Aventurine stone dial. A perfect mix between art and technical poetry.’’

Demonstrating its rich British history and quality Swiss craftsmanship, Arnold & Son unveils a new version of the HM Perpetual Moon with a blue Aventurine stone dial. The HM Perpetual Moon is a testament to Arnold & Son’s tradition of watches with astronomical indications. Our timepieces in the Royal Collection demonstrate the brand’s prowess in traditional watchmaking and classical decorative arts.

The sophisticated HM Perpetual Moon Aventurine is, indeed, a superb example of Arnold & Son’s technical and artistic excellence. From the inside out, this new timepiece with rich blue guilloché moon disc and engraved moon surprises and delights. It houses the exclusive Arnold & Son mechanical hand-wound movement, the calibre A&S1512. This calibre was especially developed for our moonphase watches with the objective of offering a uniquely precise, big and three-dimensional moonphase. The calibre is also equipped with a double barrel to yield 90 hours of power reserve. 

The HM Perpetual Moon Aventurine offers one of the most accurate moon phases on the market, with only one day’s deviation every 122 years at which point a single push on the corrector will keep it in sync for another 122 years. 

The exceptional perpetual moonphase indication of this watch is a marvel in many ways. From the aesthetic side, the 29 mm moonphase disc, which runs from 10 to 2 o’clock on the dial, reveals one of the largest moons on the market with a diameter of 11.2 mm for the moon alone. Additionally, this large moon is one of the most visually stunning recreations of the moon because it is a three-dimensional sculptured moon that was first hand-engraved and then duplicated in a 18k red gold plate for the series. The sculptured moon is then inserted into the guilloché disc.  

From the technical side, in addition to the HM Perpetual Moon Aventurine being so precise, it is also an intriguing complication in that it is not simply a module added to the movement, but, in fact, is fully integrated into the calibre. The watch also has a unique easy-to-set feature thanks to the ingenious addition of a second moon indication installed at the back of the movement. This second moon display, visible via a transparent case back, features a graduated dial and a pointer hand that allows a more exact setting. 

The multiple technological advancements in the calibre make this timepiece truly outstanding. To further underscore that, the entire rhodium treated nickel-silver movement features hand finishing indicative of the finest Haute Horlogerie timepieces, including manually chamfered bridges with polished edges, Cô tes de Genève rayonnantes and fine circular graining, circular grained wheels, and blued screws with polished and chamfered edges. The timepiece naturally features an anti-reflective sapphire crystal and case back to view the meticulous details.

The HM Perpetual Moon Aventurine measures 42 mm in diameter in its classically elegant Red Gold (5N) case. Viewed from the side, the housing is stepped and tapers from top to bottom, the widest section accommodating the extra-large glass with the lower part narrowing to fit snugly on the wrist. Each is finished with an exquisite handstitched alligator strap. In all, the HM Perpetual Moon Aventurine is a beguiling work of technical mastery and fine art. 

Main technical characteristics:

Calibre:
A&S1512
Exclusive Arnold & Son mechanical movement, hand-wound, big perpetual moon, 27 jewels, diameter 34 mm, thickness 5.35 mm, power reserve 90 h, two barrels, 21'600 vibrations/h

Functions: hours, minutes, big perpetual moon, diameter disc: 29 mm, diameter moon: 11.2 mm, second moonphase indication on the back for setting purposes

Movement decoration:
nickel-silver movement, rhodium treated with Haute Horlogerie finishing: manually chamfered bridges with polished edges, fine circular graining and Côtes de Genève rayonnantes , blued screws with polished and chamfered edges

Dials:
Aventurine stone dial, translucent blue lacquered guilloché moon disc with a 18k red gold moon and stars; back dial: fine circular graining, rhodium treated, rendition of the 8 phases of the moon

Case: 18k red gold, diameter 42 mm, cambered sapphire with anti-reflective coating on both sides, case back see-through sapphire, water-resistant to 30m

Strap: hand-stitched brown alligator leather

Reference: 1GLAR.A01A.C123A