Watch Paparazzi

Royal Yang Di-pertuan Agong Of Malaysia Sultan Muhammad V spotted wearing Jacob & Co

Sultan Muhammad V, the Yang Di-pertuan Agong of Malaysia, was recently photographed wearing one of the rarest and most architecturally complex wristwatches in current production — the Jacob & Co Astronomia Black Gold, reference AT100.31.AC.SD.A. The sighting is entirely in character for a monarch whose watch collection is widely regarded as among the most ambitious held by any sitting head of state.

The Jacob & Co Astronomia Tourbillon ref. AT100.31.AC.SD.A is powered by the in-house JCAM09 manually wound movement, a 287-component calibre operating at 18,000 vph and delivering approximately 60 hours of power reserve. The watch's defining feature is a patented four-arm rotating carousel that makes one full revolution every 20 minutes, carrying a triple-axis tourbillon cage, a 1-carat Jacob-cut diamond functioning as a seconds indicator, a miniature rotating Earth globe, and a time display subdial. The case is crafted in black gold — an alloy treated to achieve its deep, non-reflective hue — measuring 47mm and offering 30 metres of water resistance. The dial side is fully skeletonised beneath a domed sapphire crystal, leaving the mechanical spectacle entirely visible.

This specific reference is limited to 18 examples globally, a production number that places it firmly in ultra-rare grand complication territory. Jacob & Co has built the Astronomia family into one of the most recognisable mechanical sculptures in contemporary watchmaking since its debut in 2014, and the black gold variant amplifies the drama of the original concept with its sombre, high-contrast aesthetic.

For a reigning monarch, the AT100.31.AC.SD.A communicates something precise: an interest not merely in luxury but in extreme mechanical invention. Sultan Muhammad V has previously been photographed with pieces from Richard Mille and other high-complication independents, suggesting a collector sensibility oriented toward avant-garde horology rather than traditional prestige alone.

At a UK list price of £525,000 — approximately $660,000 at current exchange — the Jacob & Co Astronomia Black Gold ref. AT100.31.AC.SD.A sits at the summit of independent watchmaking's price hierarchy. Grey market activity for this reference is virtually non-existent given its 18-piece limitation, meaning provenance and direct relationships with the manufacture determine access entirely.