The H. Moser & Cie Endeavour Perpetual Moon is an exceptional timepiece with a sophisticated moon phase complication that defines precision. As we learned that an orbit of the moon around the Earth in relation to the sun is about 29.53059 days, Moser took on the challenge to create a moon phase perpetual movement that only needs adjustment once each 1,000 years which deviates only by a single day from the actual progress of the moon. This extraordinary achievement is marked in a unique display on the aperture at 6 o’clock of the dial. Designated by lines above the moon phase, eight astronomical moon quarters can be defined; and division into days from the smaller increments on the lower edge of the display. The interval is translated so precisely that the resulting deviation is only 0.23 seconds per day. Fashioned with an attractive midnight blue fumé dial, the timepiece is encased with the warmth of an 18K pink gold and matching indexes and hands. Furthermore, an additional small hand centrally placed synchronized with the 24 hour hands cleverly identifies the day and night indication.

Powered by the in-house manual wound HMC 348.901, the twin barrel calibre with hacking seconds guarantees a power reserve of 7 days from a full wound and can be observed on the movement side of the timepiece. An interchangeable escapement module pioneered by Moser, and the execution of the escapement wheel and pallet fork in solid gold adds intrinsic value to the movement.

Preserved in excellent overall condition and accompanied with its full-set of accessories, this is a great opportunity for connoisseurs to acquire a remarkable horological example of modernity and brevity.