The Watch: Arnold & Son operates at the intersection of horological heritage and modern haute horlogerie. Named for John Arnold, an 18th-century British watchmaker whose marine chronometers accompanied early explorers, the brand today is known for its inventive complications and symmetrical designs. Its modern incarnation operates as the watchmaking arm of La Joux-Perret, the renowned movement manufacturer.
The HM Double Hemisphere Perpetual Moon is a dramatic expression of both art and astronomy. It features two expansive moonphase apertures, one each for the Northern and Southern Hemispheres, displayed against a star-strewn sky. The moon discs are richly detailed, each being cast from a hand-sculpted original, and the perpetual moon complication is one of the most accurate on the market—requiring correction only once every 122 years.
The red gold case measures 42mm across and just under 12mm thick, paired with a deep blue guilloché dial that plays beautifully with light. Inside is the Arnold & Son caliber A&S1512, developed and produced by La Joux-Perret. It's manually wound, features twin barrels for a 90-hour power reserve, and is finished with côtes de Genève, polished bevels, blued screws, and a moonphase indicator on for precise setting—all visible through the sapphire caseback.
Condition: Excellent pre-owned condition with no major marks. Appears nearly unworn. Open date. Runs well with all functions working properly.
Includes: Full set: box, papers, and documentation.
