A stunning watch of pristine, pared back aesthetics, with a rare exotic dial which shimmers and twinkles as the light glances off its dark glassy surface, the Endeavour Perpetual Moon Concept Aventurine by H. Moser & Cie. imitates the depths of the night sky to spectacular effect, in a display whose simplistic purity belies the complexity of one of Haute Horlogerie’s true grand complications.

Based in Schaffhausen, the family owned H. Moser & Cie is a remarkable independent company which is obsessive about what Swiss watchmaking should be, championing authentic Swiss watchmaking in an age where the “Swiss Made” term has become open to interpretation. Using only local skills, suppliers and with almost every component manufactured in-house, that attention to detail and provenance is evident on every piece they produce, and for the individual who values elegance, sophistication and sheer, simple beauty, the Endeavour Perpetual Moon Concept Aventurine is a magnificent expression of its uncompromising standards.

The polished 42mm case in 5N rose gold is outstanding in its simplicity, with its lovely cupcake crown and soft, contoured lines which flow from the round case to the tips of its lugs in a singular graceful sweep. Curvaceous and immaculate it is so distinctive that even without even so much as a hint of branding on its remarkable dial, the Endeavour Perpetual Moon Concept Aventurine is unmistakably Moser.

The sapphire crystal is subtly domed, and beneath it the aventurine dial is completely unspoiled by any conventional hour markings, so throughout the deep, dark glassy blue, hundreds of tiny embedded metallic particle inclusions sparkle and glint with every motion of the wrist. It is very beautiful, and its celestial nature is the perfect complement to the generous moon phase display, where a matching navy blue disc passes over a silvery moon in a round aperture. The hours and minutes hands in rose gold are the signature slender Moser leaf shape which taper to fine points, with a fine pointer for the seconds. A fourth hand is much less obvious, but the tiny bud at the centre indicates the 24-hour day/night.

On the underside, a sapphire caseback reveals the uncompromising hand finishing which is applied to every component of the superb Calibre 801 hand winding movement which ticks within. Entirely manufactured in house, what resides beneath that spartan dial side is a complex and beautifully executed piece of Haute Horlogerie, whose perpetual calendar and moon phase is so precise it requires a manual correction only once in 1,027 years, and can be set via to a single minute. The movement features several H. Moser innovations, including interchangeable escapement module, and screw calibrated balance with Straumann Double Hairspring beating at a leisurely 18’000 vib/h, and double barrel which provides power for a minimum of seven days.

A gorgeous watch in the unmistakable style of H. Moser & Cie, where less can be more and where the understated can be spectacular, it is elegant and immaculately executed, and in a production of only fifty pieces in rose gold, this Endeavour Perpetual Moon Concept Aventurine is as exclusive as it is beautiful too.