Not all images were able to load for printing. Please close the print window and try again. Yema’s Ambitious new Spacegraf Heure Siderale Tourbillon Volant Limited Edition
Yema looks up with its most ambitious Millésime watch yet, combining a flying tourbillon with a rotating celestial disc that follows the rhythm of sidereal time.
Yema’s Millésime series represents the most elaborate example of its watchmaking ambitions, offering French manufacturing and complications rarely encountered at this price level, in limited production series. Following last year’s Superman Tourbillon Millésime CMM.31, the brand introduces a very different creation for 2026, potentially its most ambitious to date: the Spacegraf Heure Sidérale Tourbillon Volant. Here, Yema pairs a tourbillon regulator with a celestial display inspired by the astronomical observations that helped establish Besançon as a centre of French watchmaking. It’s a connection that goes back to 1878, when the Besançon Observatory was created to help local watchmakers regulate their timepieces through astronomical observations.
The Spacegraf Heure Sidérale Tourbillon Volant is housed in a 42mm Grade 5 titanium case measuring 12.15mm thick. The curved case exhibits a variety of contrasting brushed finishes and some polished accents. Sharp angles define the lugs, while the double-domed sapphire crystal tops the case. The fluted 3 o’clock crown features the Yema logo. The sapphire crystal caseback offers a clear view of the movement. Water resistance is 100m.
Unlike the Superman Tourbillon Millésime, which combined a tourbillon with the traditional architecture of a professional dive watch, the Spacegraf has a dial dedicated to astronomy. Its layout centres on the celestial disc at 12 o’clock and the flying tourbillon at 6. The black dial features a fine sandblasted texture beneath a black PVD coating, framed by a circular-brushed minutes track, with double-digit numerals to mark 5-minute intervals. Apart from the flying tourbillon, the main attraction is the rotating celestial disc, which completes one revolution every sidereal day: 23 hours, 56 minutes and 4 seconds. Unlike a 24-hour display, sidereal time measures Earth’s rotation relative to distant stars rather than the Sun.
The central handset indicates time, with a small hand mounted on top of the tourbillon cage to show the running seconds. The hands, hour-marker ring, minutes track, ring framing the celestial disc aperture, and graduated frame around the tourbillon all glow in dark blue, with some elements shaped from solid Super-LumiNova blocks.
The new Spacegraf Heure Sidérale Tourbillon Volant is powered by the calibre manufacture CMM.32, produced in Morteau, France. It builds on the movement construction used for Yema’s previous tourbillon models and was developed with watchmaker Olivier Mory. A large barrel delivers a power reserve of 105 hours, and the movement is designed to withstand shocks, vibrations and accelerations of up to 5,000 Gs in all directions. Through the display caseback, the movement is finished in blue and decorated with a celestial map, while the barrel cover, in a different shade of blue, represents the world map.
The Yema Spacegraf Heure Sidérale Tourbillon Volant Millésime 2026 is worn on a black leather strap with matching black stitching, closed with a titanium pin buckle. The lining is embossed with “Manufacture Française – Fondée en 1948”. It is a limited edition of 150 pieces, and the price is EUR 14,500. For more information, please visit Yema.com.
